21237745000 has 40 divisors (see below), whose sum is σ = 49760048250. Its totient is φ = 8495096000.

The previous prime is 21237744967. The next prime is 21237745049. The reversal of 21237745000 is 54773212.

It can be written as a sum of positive squares in 5 ways, for example, as 1047040164 + 20190704836 = 32358^2 + 142094^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-3 number, since 3×21237745000³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2118775 + ... + 2128774.

Almost surely, 2^21237745000 is an apocalyptic number.

21237745000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21237745000 is an abundant number, since it is smaller than the sum of its proper divisors (28522303250).

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

21237745000 is an equidigital number, since it uses as much as digits as its factorization.

21237745000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4247575 (or 4247556 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 31.

The spelling of 21237745000 in words is "twenty-one billion, two hundred thirty-seven million, seven hundred forty-five thousand".