21642264201325 has 12 divisors (see below), whose sum is σ = 26837807318388. Its totient is φ = 17312908323200.

The previous prime is 21642264201289. The next prime is 21642264201401. The reversal of 21642264201325 is 52310246224612.

It can be written as a sum of positive squares in 6 ways, for example, as 166213582249 + 21476050619076 = 407693^2 + 4634226^2 .

It is not a de Polignac number, because 21642264201325 - 2⁷ = 21642264201197 is a prime.

It is a Duffinian number.

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, 22086832 + ... + 23045881.

It is an arithmetic number, because the mean of its divisors is an integer number (2236483943199).

Almost surely, 2^{21642264201325} is an apocalyptic number.

21642264201325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21642264201325 is a deficient number, since it is larger than the sum of its proper divisors (5195543117063).

21642264201325 is a wasteful number, since it uses less digits than its factorization.

21642264201325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45151904 (or 45151899 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 40.

The spelling of 21642264201325 in words is "twenty-one trillion, six hundred forty-two billion, two hundred sixty-four million, two hundred one thousand, three hundred twenty-five".