25231402100 has 36 divisors (see below), whose sum is σ = 55367354700. Its totient is φ = 9979157760.

The previous prime is 25231402087. The next prime is 25231402103. The reversal of 25231402100 is 120413252.

It can be written as a sum of positive squares in 6 ways, for example, as 76807696 + 25154594404 = 8764^2 + 158602^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25231402103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1408595 + ... + 1426394.

It is an arithmetic number, because the mean of its divisors is an integer number (1537982075).

Almost surely, 2^25231402100 is an apocalyptic number.

25231402100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25231402100 is an abundant number, since it is smaller than the sum of its proper divisors (30135952600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25231402100 is a wasteful number, since it uses less digits than its factorization.

25231402100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2835092 (or 2835085 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 25231402100 its reverse (120413252), we get a palindrome (25351815352).

The spelling of 25231402100 in words is "twenty-five billion, two hundred thirty-one million, four hundred two thousand, one hundred".