21023223112 has 16 divisors (see below), whose sum is σ = 40777803900. Its totient is φ = 10149142080.

The previous prime is 21023223073. The next prime is 21023223139. The reversal of 21023223112 is 21132232012.

It can be written as a sum of positive squares in 2 ways, for example, as 18405263556 + 2617959556 = 135666^2 + 51166^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21023223112.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45308439 + ... + 45308902.

Almost surely, 2^21023223112 is an apocalyptic number.

It is an amenable number.

21023223112 is a deficient number, since it is larger than the sum of its proper divisors (19754580788).

21023223112 is a wasteful number, since it uses less digits than its factorization.

21023223112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90617376 (or 90617372 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21023223112 its reverse (21132232012), we get a palindrome (42155455124).

The spelling of 21023223112 in words is "twenty-one billion, twenty-three million, two hundred twenty-three thousand, one hundred twelve".