25464376221 has 32 divisors (see below), whose sum is σ = 35445915648. Its totient is φ = 16243053120.

The previous prime is 25464376219. The next prime is 25464376247. The reversal of 25464376221 is 12267346452.

It is not a de Polignac number, because 25464376221 - 2¹ = 25464376219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25464376261) 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, 2982060 + ... + 2990586.

It is an arithmetic number, because the mean of its divisors is an integer number (1107684864).

Almost surely, 2^25464376221 is an apocalyptic number.

It is an amenable number.

25464376221 is a deficient number, since it is larger than the sum of its proper divisors (9981539427).

25464376221 is a wasteful number, since it uses less digits than its factorization.

25464376221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8921.

The product of its digits is 483840, while the sum is 42.

The spelling of 25464376221 in words is "twenty-five billion, four hundred sixty-four million, three hundred seventy-six thousand, two hundred twenty-one".