21507152116570 has 32 divisors (see below), whose sum is σ = 39658966711056. Its totient is φ = 8392637836800.

The previous prime is 21507152116493. The next prime is 21507152116579. The reversal of 21507152116570 is 7561125170512.

It can be written as a sum of positive squares in 8 ways, for example, as 12428663735761 + 9078488380809 = 3525431^2 + 3013053^2 .

It is not an unprimeable number, because it can be changed into a prime (21507152116579) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7509580 + ... + 9970360.

Almost surely, 2^{21507152116570} is an apocalyptic number.

21507152116570 is a deficient number, since it is larger than the sum of its proper divisors (18151814594486).

21507152116570 is a wasteful number, since it uses less digits than its factorization.

21507152116570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2482146.

The product of its (nonzero) digits is 147000, while the sum is 43.

The spelling of 21507152116570 in words is "twenty-one trillion, five hundred seven billion, one hundred fifty-two million, one hundred sixteen thousand, five hundred seventy".