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21120211221201 = 3217138040596217
BaseRepresentation
bin1001100110101011011101…
…01011111111101011010001
32202210001221211111200122200
410303111232223333223101
510232013143033034301
6112530254024153413
74306612344214401
oct463255653775321
982701854450580
1021120211221201
1168030386a4724
1224512a4008869
13ba282044c5a1
1453031bab0801
152695b9dc6c86
hex13356eaffad1

21120211221201 has 12 divisors (see below), whose sum is σ = 32301499515012. Its totient is φ = 13251897236736.

The previous prime is 21120211221199. The next prime is 21120211221233. The reversal of 21120211221201 is 10212211202112.

21120211221201 is a `hidden beast` number, since 2 + 11 + 20 + 211 + 221 + 201 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 18158975982225 + 2961235238976 = 4261335^2 + 1720824^2 .

It is not a de Polignac number, because 21120211221201 - 21 = 21120211221199 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21120211221101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69020297956 + ... + 69020298261.

It is an arithmetic number, because the mean of its divisors is an integer number (2691791626251).

Almost surely, 221120211221201 is an apocalyptic number.

It is an amenable number.

21120211221201 is a deficient number, since it is larger than the sum of its proper divisors (11181288293811).

21120211221201 is a wasteful number, since it uses less digits than its factorization.

21120211221201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138040596240 (or 138040596237 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21120211221201 its reverse (10212211202112), we get a palindrome (31332422423313).

The spelling of 21120211221201 in words is "twenty-one trillion, one hundred twenty billion, two hundred eleven million, two hundred twenty-one thousand, two hundred one".

Divisors: 1 3 9 17 51 153 138040596217 414121788651 1242365365953 2346690135689 7040070407067 21120211221201