21023203012 has 24 divisors (see below), whose sum is σ = 43182797504. Its totient is φ = 8766431712.

The previous prime is 21023203007. The next prime is 21023203039. The reversal of 21023203012 is 21030232012.

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, 10145298 + ... + 10147369.

Almost surely, 2^21023203012 is an apocalyptic number.

It is an amenable number.

21023203012 is an abundant number, since it is smaller than the sum of its proper divisors (22159594492).

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

21023203012 is a wasteful number, since it uses less digits than its factorization.

21023203012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20292715 (or 20292713 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21023203012 its reverse (21030232012), we get a palindrome (42053435024).

The spelling of 21023203012 in words is "twenty-one billion, twenty-three million, two hundred three thousand, twelve".