21071733985500 has 96 divisors (see below), whose sum is σ = 66939152087808. Its totient is φ = 5108299144000.

The previous prime is 21071733985487. The next prime is 21071733985543. The reversal of 21071733985500 is 558933717012.

It is a super-3 number, since 3×21071733985500³ (a number of 41 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 31 ways as a sum of consecutive naturals, for example, 638520894 + ... + 638553893.

It is an arithmetic number, because the mean of its divisors is an integer number (697282834248).

Almost surely, 2^{21071733985500} is an apocalyptic number.

21071733985500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21071733985500 is an abundant number, since it is smaller than the sum of its proper divisors (45867418102308).

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

21071733985500 is a wasteful number, since it uses less digits than its factorization.

21071733985500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1277074820 (or 1277074808 counting only the distinct ones).

The product of its (nonzero) digits is 1587600, while the sum is 51.

The spelling of 21071733985500 in words is "twenty-one trillion, seventy-one billion, seven hundred thirty-three million, nine hundred eighty-five thousand, five hundred".