21037506711945 has 32 divisors (see below), whose sum is σ = 34602633955200. Its totient is φ = 10906372915200.

The previous prime is 21037506711937. The next prime is 21037506711997. The reversal of 21037506711945 is 54911760573012.

It is not a de Polignac number, because 21037506711945 - 2³ = 21037506711937 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17449720 + ... + 18616329.

It is an arithmetic number, because the mean of its divisors is an integer number (1081332311100).

Almost surely, 2^{21037506711945} is an apocalyptic number.

It is an amenable number.

21037506711945 is a deficient number, since it is larger than the sum of its proper divisors (13565127243255).

21037506711945 is a wasteful number, since it uses less digits than its factorization.

21037506711945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36067145.

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

The spelling of 21037506711945 in words is "twenty-one trillion, thirty-seven billion, five hundred six million, seven hundred eleven thousand, nine hundred forty-five".