25621242031 has 16 divisors (see below), whose sum is σ = 32019644160. Its totient is φ = 19916930880.

The previous prime is 25621242019. The next prime is 25621242043. The reversal of 25621242031 is 13024212652.

It is an interprime number because it is at equal distance from previous prime (25621242019) and next prime (25621242043).

It is not a de Polignac number, because 25621242031 - 2⁷ = 25621241903 is a prime.

It is a super-2 number, since 2×25621242031² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25621242331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 364806 + ... + 429331.

It is an arithmetic number, because the mean of its divisors is an integer number (2001227760).

Almost surely, 2^25621242031 is an apocalyptic number.

25621242031 is a deficient number, since it is larger than the sum of its proper divisors (6398402129).

25621242031 is a wasteful number, since it uses less digits than its factorization.

25621242031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794574.

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 25621242031 its reverse (13024212652), we get a palindrome (38645454683).

The spelling of 25621242031 in words is "twenty-five billion, six hundred twenty-one million, two hundred forty-two thousand, thirty-one".