21023248012 has 24 divisors (see below), whose sum is σ = 40005414176. Its totient is φ = 9608830848.

The previous prime is 21023247913. The next prime is 21023248013. The reversal of 21023248012 is 21084232012.

It is not an unprimeable number, because it can be changed into a prime (21023248013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1957233 + ... + 1967944.

Almost surely, 2^21023248012 is an apocalyptic number.

It is an amenable number.

21023248012 is a deficient number, since it is larger than the sum of its proper divisors (18982166164).

21023248012 is a wasteful number, since it uses less digits than its factorization.

21023248012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3925297 (or 3925295 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The spelling of 21023248012 in words is "twenty-one billion, twenty-three million, two hundred forty-eight thousand, twelve".