21356325751625 has 16 divisors (see below), whose sum is σ = 26666879341440. Its totient is φ = 17075967778800.

The previous prime is 21356325751603. The next prime is 21356325751669. The reversal of 21356325751625 is 52615752365312.

It is a de Polignac number, because none of the positive numbers 2^k-21356325751625 is a prime.

It is a super-2 number, since 2×21356325751625² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45228299 + ... + 45698048.

It is an arithmetic number, because the mean of its divisors is an integer number (1666679958840).

Almost surely, 2^{21356325751625} is an apocalyptic number.

21356325751625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21356325751625 is a deficient number, since it is larger than the sum of its proper divisors (5310553589815).

21356325751625 is an equidigital number, since it uses as much as digits as its factorization.

21356325751625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90928241 (or 90928231 counting only the distinct ones).

The product of its digits is 11340000, while the sum is 53.

The spelling of 21356325751625 in words is "twenty-one trillion, three hundred fifty-six billion, three hundred twenty-five million, seven hundred fifty-one thousand, six hundred twenty-five".