21023021996 has 12 divisors (see below), whose sum is σ = 36810394320. Its totient is φ = 10505766480.

The previous prime is 21023021989. The next prime is 21023022011. The reversal of 21023021996 is 69912032012.

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, 1427891 + ... + 1442538.

It is an arithmetic number, because the mean of its divisors is an integer number (3067532860).

Almost surely, 2^21023021996 is an apocalyptic number.

It is an amenable number.

21023021996 is a deficient number, since it is larger than the sum of its proper divisors (15787372324).

21023021996 is a wasteful number, since it uses less digits than its factorization.

21023021996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2872264 (or 2872262 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 35.

The spelling of 21023021996 in words is "twenty-one billion, twenty-three million, twenty-one thousand, nine hundred ninety-six".