21102211001021 has 32 divisors (see below), whose sum is σ = 22855485616128. Its totient is φ = 19432227386880.

The previous prime is 21102211001017. The next prime is 21102211001023. The reversal of 21102211001021 is 12010011220112.

It is a cyclic number.

It is not a de Polignac number, because 21102211001021 - 2² = 21102211001017 is a prime.

It is a super-2 number, since 2×21102211001021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21102211000987 and 21102211001005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102211001023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 264475085 + ... + 264554861.

It is an arithmetic number, because the mean of its divisors is an integer number (714233925504).

Almost surely, 2^{21102211001021} is an apocalyptic number.

It is an amenable number.

21102211001021 is a deficient number, since it is larger than the sum of its proper divisors (1753274615107).

21102211001021 is a wasteful number, since it uses less digits than its factorization.

21102211001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83681.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21102211001021 its reverse (12010011220112), we get a palindrome (33112222221133).

The spelling of 21102211001021 in words is "twenty-one trillion, one hundred two billion, two hundred eleven million, one thousand, twenty-one".