253707861921 has 16 divisors (see below), whose sum is σ = 340784918400. Its totient is φ = 167888730240.

The previous prime is 253707861889. The next prime is 253707861931. The reversal of 253707861921 is 129168707352.

It is not a de Polignac number, because 253707861921 - 2⁵ = 253707861889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (253707861931) 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, 253380 + ... + 756053.

It is an arithmetic number, because the mean of its divisors is an integer number (21299057400).

Almost surely, 2^253707861921 is an apocalyptic number.

It is an amenable number.

253707861921 is a deficient number, since it is larger than the sum of its proper divisors (87077056479).

253707861921 is a wasteful number, since it uses less digits than its factorization.

253707861921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010056.

The product of its (nonzero) digits is 1270080, while the sum is 51.

The spelling of 253707861921 in words is "two hundred fifty-three billion, seven hundred seven million, eight hundred sixty-one thousand, nine hundred twenty-one".