21152513145 has 32 divisors (see below), whose sum is σ = 35032291200. Its totient is φ = 10885722624.

The previous prime is 21152513141. The next prime is 21152513153. The reversal of 21152513145 is 54131525112.

It is not a de Polignac number, because 21152513145 - 2² = 21152513141 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21152513141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 748686 + ... + 776424.

It is an arithmetic number, because the mean of its divisors is an integer number (1094759100).

Almost surely, 2^21152513145 is an apocalyptic number.

It is an amenable number.

21152513145 is a deficient number, since it is larger than the sum of its proper divisors (13879778055).

21152513145 is a wasteful number, since it uses less digits than its factorization.

21152513145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29529.

The product of its digits is 6000, while the sum is 30.

The spelling of 21152513145 in words is "twenty-one billion, one hundred fifty-two million, five hundred thirteen thousand, one hundred forty-five".