21160136725 has 144 divisors (see below), whose sum is σ = 35565723648. Its totient is φ = 12330178560.

The previous prime is 21160136693. The next prime is 21160136731. The reversal of 21160136725 is 52763106112.

It is not a de Polignac number, because 21160136725 - 2⁵ = 21160136693 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 12723244 + ... + 12724906.

It is an arithmetic number, because the mean of its divisors is an integer number (246984192).

Almost surely, 2^21160136725 is an apocalyptic number.

21160136725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21160136725 is a deficient number, since it is larger than the sum of its proper divisors (14405586923).

21160136725 is a wasteful number, since it uses less digits than its factorization.

21160136725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1764 (or 1752 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 34.

The spelling of 21160136725 in words is "twenty-one billion, one hundred sixty million, one hundred thirty-six thousand, seven hundred twenty-five".