21625258128263 has 16 divisors (see below), whose sum is σ = 23040664159680. Its totient is φ = 20257696521216.

The previous prime is 21625258128259. The next prime is 21625258128289. The reversal of 21625258128263 is 36282185252612.

It is a cyclic number.

It is not a de Polignac number, because 21625258128263 - 2² = 21625258128259 is a prime.

It is a super-2 number, since 2×21625258128263² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21625258128203) 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, 28167995 + ... + 28925532.

It is an arithmetic number, because the mean of its divisors is an integer number (1440041509980).

Almost surely, 2^{21625258128263} is an apocalyptic number.

21625258128263 is a deficient number, since it is larger than the sum of its proper divisors (1415406031417).

21625258128263 is a wasteful number, since it uses less digits than its factorization.

21625258128263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57093946.

The product of its digits is 5529600, while the sum is 53.

The spelling of 21625258128263 in words is "twenty-one trillion, six hundred twenty-five billion, two hundred fifty-eight million, one hundred twenty-eight thousand, two hundred sixty-three".