21455861062418 has 8 divisors (see below), whose sum is σ = 32185445240448. Its totient is φ = 10727379315604.

The previous prime is 21455861062399. The next prime is 21455861062477. The reversal of 21455861062418 is 81426016855412.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21455861062418.

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, 275559146 + ... + 275636997.

It is an arithmetic number, because the mean of its divisors is an integer number (4023180655056).

Almost surely, 2^{21455861062418} is an apocalyptic number.

21455861062418 is a deficient number, since it is larger than the sum of its proper divisors (10729584178030).

21455861062418 is a wasteful number, since it uses less digits than its factorization.

21455861062418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551215608.

The product of its (nonzero) digits is 3686400, while the sum is 53.

The spelling of 21455861062418 in words is "twenty-one trillion, four hundred fifty-five billion, eight hundred sixty-one million, sixty-two thousand, four hundred eighteen".