21021223112 has 32 divisors (see below), whose sum is σ = 42051921120. Its totient is φ = 9816817920.

The previous prime is 21021223087. The next prime is 21021223123. The reversal of 21021223112 is 21132212012.

It is a super-2 number, since 2×21021223112² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 572138 + ... + 607769.

It is an arithmetic number, because the mean of its divisors is an integer number (1314122535).

Almost surely, 2^21021223112 is an apocalyptic number.

It is an amenable number.

21021223112 is an abundant number, since it is smaller than the sum of its proper divisors (21030698008).

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

21021223112 is a wasteful number, since it uses less digits than its factorization.

21021223112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1180061 (or 1180057 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21021223112 its reverse (21132212012), we get a palindrome (42153435124).

The spelling of 21021223112 in words is "twenty-one billion, twenty-one million, two hundred twenty-three thousand, one hundred twelve".