21012497384 has 32 divisors (see below), whose sum is σ = 39533268000. Its totient is φ = 10470358080.

The previous prime is 21012497381. The next prime is 21012497393. The reversal of 21012497384 is 48379421012.

It is not an unprimeable number, because it can be changed into a prime (21012497381) 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, 3020342 + ... + 3027290.

It is an arithmetic number, because the mean of its divisors is an integer number (1235414625).

Almost surely, 2^21012497384 is an apocalyptic number.

It is an amenable number.

21012497384 is a deficient number, since it is larger than the sum of its proper divisors (18520770616).

21012497384 is a wasteful number, since it uses less digits than its factorization.

21012497384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8193 (or 8189 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 41.

The spelling of 21012497384 in words is "twenty-one billion, twelve million, four hundred ninety-seven thousand, three hundred eighty-four".