25521421124 has 12 divisors (see below), whose sum is σ = 44666908944. Its totient is φ = 12759447144.

The previous prime is 25521421097. The next prime is 25521421141. The reversal of 25521421124 is 42112412552.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 269654 + ... + 351789.

It is an arithmetic number, because the mean of its divisors is an integer number (3722242412).

Almost surely, 2^25521421124 is an apocalyptic number.

It is an amenable number.

25521421124 is a deficient number, since it is larger than the sum of its proper divisors (19145487820).

25521421124 is a wasteful number, since it uses less digits than its factorization.

25521421124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631714 (or 631712 counting only the distinct ones).

The product of its digits is 6400, while the sum is 29.

Adding to 25521421124 its reverse (42112412552), we get a palindrome (67633833676).

The spelling of 25521421124 in words is "twenty-five billion, five hundred twenty-one million, four hundred twenty-one thousand, one hundred twenty-four".