21520734537032 has 16 divisors (see below), whose sum is σ = 40351456558140. Its totient is φ = 10760346121536.

The previous prime is 21520734536989. The next prime is 21520734537077. The reversal of 21520734537032 is 23073543702512.

It can be written as a sum of positive squares in 2 ways, for example, as 17342610486916 + 4178124050116 = 4164446^2 + 2044046^2 .

It is a super-4 number, since 4×21520734537032⁴ (a number of 54 digits) contains 4444 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2204798 + ... + 6921170.

Almost surely, 2^{21520734537032} is an apocalyptic number.

It is an amenable number.

21520734537032 is a deficient number, since it is larger than the sum of its proper divisors (18830722021108).

21520734537032 is a wasteful number, since it uses less digits than its factorization.

21520734537032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5286752 (or 5286748 counting only the distinct ones).

The product of its (nonzero) digits is 1058400, while the sum is 44.

The spelling of 21520734537032 in words is "twenty-one trillion, five hundred twenty billion, seven hundred thirty-four million, five hundred thirty-seven thousand, thirty-two".