21536473160 has 16 divisors (see below), whose sum is σ = 48457064700. Its totient is φ = 8614589248.

The previous prime is 21536473141. The next prime is 21536473181. The reversal of 21536473160 is 6137463512.

It can be written as a sum of positive squares in 2 ways, for example, as 18739967236 + 2796505924 = 136894^2 + 52882^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 269205875 + ... + 269205954.

Almost surely, 2^21536473160 is an apocalyptic number.

21536473160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21536473160 is an abundant number, since it is smaller than the sum of its proper divisors (26920591540).

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

21536473160 is a wasteful number, since it uses less digits than its factorization.

21536473160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538411840 (or 538411836 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 38.

The spelling of 21536473160 in words is "twenty-one billion, five hundred thirty-six million, four hundred seventy-three thousand, one hundred sixty".