21011202101 has 6 divisors (see below), whose sum is σ = 21511200150. Its totient is φ = 20522567688.

The previous prime is 21011202083. The next prime is 21011202109. The reversal of 21011202101 is 10120211012.

It can be written as a sum of positive squares in only one way, i.e., 10739176900 + 10272025201 = 103630^2 + 101351^2 .

It is not a de Polignac number, because 21011202101 - 2²⁶ = 20944093237 is a prime.

It is a super-2 number, since 2×21011202101² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011202109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5679926 + ... + 5683623.

It is an arithmetic number, because the mean of its divisors is an integer number (3585200025).

Almost surely, 2^21011202101 is an apocalyptic number.

It is an amenable number.

21011202101 is a deficient number, since it is larger than the sum of its proper divisors (499998049).

21011202101 is an equidigital number, since it uses as much as digits as its factorization.

21011202101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11363635 (or 11363592 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21011202101 its reverse (10120211012), we get a palindrome (31131413113).

The spelling of 21011202101 in words is "twenty-one billion, eleven million, two hundred two thousand, one hundred one".