21221000021112 has 32 divisors (see below), whose sum is σ = 53054722464000. Its totient is φ = 7073370352224.

The previous prime is 21221000021083. The next prime is 21221000021153. The reversal of 21221000021112 is 21112000012212.

It is a junction number, because it is equal to n+sod(n) for n = 21221000021091 and 21221000021100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17934862 + ... + 19081437.

It is an arithmetic number, because the mean of its divisors is an integer number (1657960077000).

Almost surely, 2^{21221000021112} is an apocalyptic number.

It is an amenable number.

21221000021112 is an abundant number, since it is smaller than the sum of its proper divisors (31833722442888).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21221000021112 is a wasteful number, since it uses less digits than its factorization.

21221000021112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37040195 (or 37040191 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21221000021112 its reverse (21112000012212), we get a palindrome (42333000033324).

The spelling of 21221000021112 in words is "twenty-one trillion, two hundred twenty-one billion, twenty-one thousand, one hundred twelve".