21220112011021 has 96 divisors (see below), whose sum is σ = 28100192799744. Its totient is φ = 15827736960000.

The previous prime is 21220112011009. The next prime is 21220112011061. The reversal of 21220112011021 is 12011021102212.

It is not a de Polignac number, because 21220112011021 - 2⁵ = 21220112010989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21220112010986 and 21220112011004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220112011061) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1885053625 + ... + 1885064881.

It is an arithmetic number, because the mean of its divisors is an integer number (292710341664).

Almost surely, 2^{21220112011021} is an apocalyptic number.

It is an amenable number.

21220112011021 is a deficient number, since it is larger than the sum of its proper divisors (6880080788723).

21220112011021 is a wasteful number, since it uses less digits than its factorization.

21220112011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12531 (or 12524 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21220112011021 its reverse (12011021102212), we get a palindrome (33231133113233).

The spelling of 21220112011021 in words is "twenty-one trillion, two hundred twenty billion, one hundred twelve million, eleven thousand, twenty-one".