51221111112215 has 32 divisors (see below), whose sum is σ = 67118873342976. Its totient is φ = 37215177183360.

The previous prime is 51221111112203. The next prime is 51221111112233.

51221111112215 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 51221111112215 - 2¹⁴ = 51221111095831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 902021714 + ... + 902078496.

It is an arithmetic number, because the mean of its divisors is an integer number (2097464791968).

Almost surely, 2^{51221111112215} is an apocalyptic number.

51221111112215 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51221111112215 is a deficient number, since it is larger than the sum of its proper divisors (15897762230761).

51221111112215 is a wasteful number, since it uses less digits than its factorization.

51221111112215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72599.

The product of its digits is 400, while the sum is 26.

It can be divided in two parts, 5122111 and 1112215, that added together give a palindrome (6234326).

The spelling of 51221111112215 in words is "fifty-one trillion, two hundred twenty-one billion, one hundred eleven million, one hundred twelve thousand, two hundred fifteen".