25213011231 has 4 divisors (see below), whose sum is σ = 33617348312. Its totient is φ = 16808674152.

The previous prime is 25213011227. The next prime is 25213011281. The reversal of 25213011231 is 13211031252.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 25213011231 - 2² = 25213011227 is a prime.

It is a super-2 number, since 2×25213011231² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25213011198 and 25213011207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25213011281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4202168536 + ... + 4202168541.

It is an arithmetic number, because the mean of its divisors is an integer number (8404337078).

Almost surely, 2^25213011231 is an apocalyptic number.

25213011231 is a deficient number, since it is larger than the sum of its proper divisors (8404337081).

25213011231 is an equidigital number, since it uses as much as digits as its factorization.

25213011231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8404337080.

The product of its (nonzero) digits is 360, while the sum is 21.

Adding to 25213011231 its reverse (13211031252), we get a palindrome (38424042483).

The spelling of 25213011231 in words is "twenty-five billion, two hundred thirteen million, eleven thousand, two hundred thirty-one".