21652612122455 has 4 divisors (see below), whose sum is σ = 25983134546952. Its totient is φ = 17322089697960.

The previous prime is 21652612122389. The next prime is 21652612122469. The reversal of 21652612122455 is 55422121625612.

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

It is not a de Polignac number, because 21652612122455 - 2⁸ = 21652612122199 is a prime.

It is a super-2 number, since 2×21652612122455² (a number of 27 digits) contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 2165261212241 + ... + 2165261212250.

It is an arithmetic number, because the mean of its divisors is an integer number (6495783636738).

Almost surely, 2^{21652612122455} is an apocalyptic number.

21652612122455 is a deficient number, since it is larger than the sum of its proper divisors (4330522424497).

21652612122455 is an equidigital number, since it uses as much as digits as its factorization.

21652612122455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4330522424496.

The product of its digits is 576000, while the sum is 44.

The spelling of 21652612122455 in words is "twenty-one trillion, six hundred fifty-two billion, six hundred twelve million, one hundred twenty-two thousand, four hundred fifty-five".