2116456321521 has 8 divisors (see below), whose sum is σ = 2822011363840. Its totient is φ = 1410936080112.

The previous prime is 2116456321501. The next prime is 2116456321597. The reversal of 2116456321521 is 1251236546112.

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

It is not a de Polignac number, because 2116456321521 - 2¹⁵ = 2116456288753 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2116456321521.

It is not an unprimeable number, because it can be changed into a prime (2116456321501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8557990 + ... + 8801823.

It is an arithmetic number, because the mean of its divisors is an integer number (352751420480).

Almost surely, 2^{2116456321521} is an apocalyptic number.

It is an amenable number.

2116456321521 is a deficient number, since it is larger than the sum of its proper divisors (705555042319).

2116456321521 is a wasteful number, since it uses less digits than its factorization.

2116456321521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17400455.

The product of its digits is 86400, while the sum is 39.

The spelling of 2116456321521 in words is "two trillion, one hundred sixteen billion, four hundred fifty-six million, three hundred twenty-one thousand, five hundred twenty-one".