21534730600 has 24 divisors (see below), whose sum is σ = 50068249110. Its totient is φ = 8613892160.

The previous prime is 21534730583. The next prime is 21534730601. The reversal of 21534730600 is 603743512.

It can be written as a sum of positive squares in 3 ways, for example, as 20272633924 + 1262096676 = 142382^2 + 35526^2 .

It is not an unprimeable number, because it can be changed into a prime (21534730601) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53836627 + ... + 53837026.

Almost surely, 2^21534730600 is an apocalyptic number.

21534730600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21534730600 is an abundant number, since it is smaller than the sum of its proper divisors (28533518510).

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

21534730600 is a wasteful number, since it uses less digits than its factorization.

21534730600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107673669 (or 107673660 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 31.

The spelling of 21534730600 in words is "twenty-one billion, five hundred thirty-four million, seven hundred thirty thousand, six hundred".