25421031 has 24 divisors (see below), whose sum is σ = 39486720. Its totient is φ = 15708816.

The previous prime is 25421027. The next prime is 25421059. The reversal of 25421031 is 13012452.

It is not a de Polignac number, because 25421031 - 2² = 25421027 is a prime.

It is a super-2 number, since 2×25421031² = 1292457634205922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25420995 and 25421013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25421021) 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, 6456 + ... + 9618.

It is an arithmetic number, because the mean of its divisors is an integer number (1645280).

Almost surely, 2^25421031 is an apocalyptic number.

25421031 is a deficient number, since it is larger than the sum of its proper divisors (14065689).

25421031 is a wasteful number, since it uses less digits than its factorization.

25421031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3235 (or 3232 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 25421031 is about 5041.9273100671. The cubic root of 25421031 is about 294.0341137702.

Adding to 25421031 its reverse (13012452), we get a palindrome (38433483).

The spelling of 25421031 in words is "twenty-five million, four hundred twenty-one thousand, thirty-one".