25421521213 has 16 divisors (see below), whose sum is σ = 29149600896. Its totient is φ = 21944285440.

The previous prime is 25421521187. The next prime is 25421521289. The reversal of 25421521213 is 31212512452.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-25421521213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25421527213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 332056 + ... + 401377.

It is an arithmetic number, because the mean of its divisors is an integer number (1821850056).

Almost surely, 2^25421521213 is an apocalyptic number.

25421521213 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

25421521213 is a deficient number, since it is larger than the sum of its proper divisors (3728079683).

25421521213 is a wasteful number, since it uses less digits than its factorization.

25421521213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 733604.

The product of its digits is 4800, while the sum is 28.

The spelling of 25421521213 in words is "twenty-five billion, four hundred twenty-one million, five hundred twenty-one thousand, two hundred thirteen".