25402321231 has 24 divisors (see below), whose sum is σ = 29883727440. Its totient is φ = 21527856000.

The previous prime is 25402321201. The next prime is 25402321261. The reversal of 25402321231 is 13212320452.

It is an interprime number because it is at equal distance from previous prime (25402321201) and next prime (25402321261).

It is not a de Polignac number, because 25402321231 - 2⁵ = 25402321199 is a prime.

It is a super-2 number, since 2×25402321231² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25402321196 and 25402321205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25402321201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4010475 + ... + 4016803.

It is an arithmetic number, because the mean of its divisors is an integer number (1245155310).

Almost surely, 2^25402321231 is an apocalyptic number.

25402321231 is a deficient number, since it is larger than the sum of its proper divisors (4481406209).

25402321231 is a wasteful number, since it uses less digits than its factorization.

25402321231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7255 (or 7248 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 25402321231 its reverse (13212320452), we get a palindrome (38614641683).

The spelling of 25402321231 in words is "twenty-five billion, four hundred two million, three hundred twenty-one thousand, two hundred thirty-one".