21304702500 has 60 divisors (see below), whose sum is σ = 62118853104. Its totient is φ = 5681252000.

The previous prime is 21304702487. The next prime is 21304702511. The reversal of 21304702500 is 520740312.

It is a tau number, because it is divible by the number of its divisors (60).

It is a super-2 number, since 2×21304702500² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1412814 + ... + 1427813.

Almost surely, 2^21304702500 is an apocalyptic number.

21304702500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21304702500 is an abundant number, since it is smaller than the sum of its proper divisors (40814150604).

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

21304702500 is a wasteful number, since it uses less digits than its factorization.

21304702500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2840654 (or 2840637 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 24.

The spelling of 21304702500 in words is "twenty-one billion, three hundred four million, seven hundred two thousand, five hundred".