21237745006 has 16 divisors (see below), whose sum is σ = 33737548464. Its totient is φ = 9992155264.

The previous prime is 21237744967. The next prime is 21237745049. The reversal of 21237745006 is 60054773212.

It is a happy number.

It is a super-3 number, since 3×21237745006³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107676 + ... + 232528.

It is an arithmetic number, because the mean of its divisors is an integer number (2108596779).

Almost surely, 2^21237745006 is an apocalyptic number.

21237745006 is a deficient number, since it is larger than the sum of its proper divisors (12499803458).

21237745006 is a wasteful number, since it uses less digits than its factorization.

21237745006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129875.

The product of its (nonzero) digits is 70560, while the sum is 37.

The spelling of 21237745006 in words is "twenty-one billion, two hundred thirty-seven million, seven hundred forty-five thousand, six".