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21011001121201 = 721384613898393
BaseRepresentation
bin1001100011100000000010…
…10000100001100110110001
32202101122001210102210101011
410301300001100201212301
510223221012241334301
6112404153132510521
74265665123533400
oct461600120414661
982348053383334
1021011001121201
116770796417133
1224340a591b441
13b954377aa340
14528d1b787637
1526682730da51
hex131c014219b1

21011001121201 has 24 divisors (see below), whose sum is σ = 26324591602344. Its totient is φ = 16622119745280.

The previous prime is 21011001121181. The next prime is 21011001121213. The reversal of 21011001121201 is 10212110011012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6852751186176 + 14158249935025 = 2617776^2 + 3762745^2 .

It is not a de Polignac number, because 21011001121201 - 227 = 21010866903473 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is not an unprimeable number, because it can be changed into a prime (21011001121001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3440461 + ... + 7338853.

It is an arithmetic number, because the mean of its divisors is an integer number (1096857983431).

Almost surely, 221011001121201 is an apocalyptic number.

It is an amenable number.

21011001121201 is a deficient number, since it is larger than the sum of its proper divisors (5313590481143).

21011001121201 is a wasteful number, since it uses less digits than its factorization.

21011001121201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3906881 (or 3906874 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21011001121201 its reverse (10212110011012), we get a palindrome (31223111132213).

The spelling of 21011001121201 in words is "twenty-one trillion, eleven billion, one million, one hundred twenty-one thousand, two hundred one".

Divisors: 1 7 13 49 91 637 8461 59227 109993 414589 769951 3898393 5389657 27288751 50679109 191021257 354753763 2483276341 32984303173 230890122211 428795941249 1616230855477 3001571588743 21011001121201