21310051325 has 12 divisors (see below), whose sum is σ = 26658311988. Its totient is φ = 16897171200.

The previous prime is 21310051319. The next prime is 21310051339. The reversal of 21310051325 is 52315001312.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 5096103769 + 16213947556 = 71387^2 + 127334^2 .

It is not a de Polignac number, because 21310051325 - 2¹⁰ = 21310050301 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21310051325.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3768866 + ... + 3774515.

It is an arithmetic number, because the mean of its divisors is an integer number (2221525999).

Almost surely, 2^21310051325 is an apocalyptic number.

21310051325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21310051325 is a deficient number, since it is larger than the sum of its proper divisors (5348260663).

21310051325 is a wasteful number, since it uses less digits than its factorization.

21310051325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7543504 (or 7543499 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 23.

Adding to 21310051325 its reverse (52315001312), we get a palindrome (73625052637).

The spelling of 21310051325 in words is "twenty-one billion, three hundred ten million, fifty-one thousand, three hundred twenty-five".