25235423665221 has 32 divisors (see below), whose sum is σ = 42805913472000. Its totient is φ = 13109310989040.

The previous prime is 25235423665211. The next prime is 25235423665253. The reversal of 25235423665221 is 12256632453252.

It is not a de Polignac number, because 25235423665221 - 2²⁶ = 25235356556357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25235423665211) 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, 1114726011 + ... + 1114748648.

It is an arithmetic number, because the mean of its divisors is an integer number (1337684796000).

Almost surely, 2^{25235423665221} is an apocalyptic number.

25235423665221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

25235423665221 is a deficient number, since it is larger than the sum of its proper divisors (17570489806779).

25235423665221 is a wasteful number, since it uses less digits than its factorization.

25235423665221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2229474694 (or 2229474680 counting only the distinct ones).

The product of its digits is 5184000, while the sum is 48.

The spelling of 25235423665221 in words is "twenty-five trillion, two hundred thirty-five billion, four hundred twenty-three million, six hundred sixty-five thousand, two hundred twenty-one".