21102211122021 has 24 divisors (see below), whose sum is σ = 30650153526720. Its totient is φ = 13990231680000.

The previous prime is 21102211121923. The next prime is 21102211122073. The reversal of 21102211122021 is 12022111220112.

21102211122021 is a `hidden beast` number, since 211 + 0 + 2 + 211 + 1 + 220 + 21 = 666.

It is not a de Polignac number, because 21102211122021 - 2²⁶ = 21102144013157 is a prime.

It is a super-2 number, since 2×21102211122021² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21102211121985 and 21102211122003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102211122821) 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, 5838561 + ... + 8734598.

It is an arithmetic number, because the mean of its divisors is an integer number (1277089730280).

Almost surely, 2^{21102211122021} is an apocalyptic number.

It is an amenable number.

21102211122021 is a deficient number, since it is larger than the sum of its proper divisors (9547942404699).

21102211122021 is a wasteful number, since it uses less digits than its factorization.

21102211122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14574057 (or 14574054 counting only the distinct ones).

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

Adding to 21102211122021 its reverse (12022111220112), we get a palindrome (33124322342133).

The spelling of 21102211122021 in words is "twenty-one trillion, one hundred two billion, two hundred eleven million, one hundred twenty-two thousand, twenty-one".