21516151120499 has 16 divisors (see below), whose sum is σ = 24656816733696. Its totient is φ = 18392284310400.

The previous prime is 21516151120489. The next prime is 21516151120523. The reversal of 21516151120499 is 99402115161512.

It is a de Polignac number, because none of the positive numbers 2^k-21516151120499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21516151120459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1126784 + ... + 6655970.

It is an arithmetic number, because the mean of its divisors is an integer number (1541051045856).

Almost surely, 2^{21516151120499} is an apocalyptic number.

21516151120499 is a deficient number, since it is larger than the sum of its proper divisors (3140665613197).

21516151120499 is an equidigital number, since it uses as much as digits as its factorization.

21516151120499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5530706.

The product of its (nonzero) digits is 194400, while the sum is 47.

The spelling of 21516151120499 in words is "twenty-one trillion, five hundred sixteen billion, one hundred fifty-one million, one hundred twenty thousand, four hundred ninety-nine".