21322554425251 has 4 divisors (see below), whose sum is σ = 21323249885104. Its totient is φ = 21321858965400.

The previous prime is 21322554425177. The next prime is 21322554425281. The reversal of 21322554425251 is 15252445522312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21322554425251 - 2³³ = 21313964490659 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21322554425198 and 21322554425207.

It is not an unprimeable number, because it can be changed into a prime (21322554425281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 347683935 + ... + 347745256.

It is an arithmetic number, because the mean of its divisors is an integer number (5330812471276).

Almost surely, 2^{21322554425251} is an apocalyptic number.

21322554425251 is a deficient number, since it is larger than the sum of its proper divisors (695459853).

21322554425251 is an equidigital number, since it uses as much as digits as its factorization.

21322554425251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695459852.

The product of its digits is 960000, while the sum is 43.

Adding to 21322554425251 its reverse (15252445522312), we get a palindrome (36574999947563).

The spelling of 21322554425251 in words is "twenty-one trillion, three hundred twenty-two billion, five hundred fifty-four million, four hundred twenty-five thousand, two hundred fifty-one".