21398924700 has 54 divisors (see below), whose sum is σ = 67073743464. Its totient is φ = 5706379680.

The previous prime is 21398924681. The next prime is 21398924711. The reversal of 21398924700 is 742989312.

21398924700 is a `hidden beast` number, since 2 + 1 + 3 + 98 + 92 + 470 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 11887392 + ... + 11889191.

Almost surely, 2^21398924700 is an apocalyptic number.

21398924700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21398924700 is an abundant number, since it is smaller than the sum of its proper divisors (45674818764).

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

21398924700 is a wasteful number, since it uses less digits than its factorization.

21398924700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23776603 (or 23776593 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The spelling of 21398924700 in words is "twenty-one billion, three hundred ninety-eight million, nine hundred twenty-four thousand, seven hundred".