21612616626187 has 2 divisors, whose sum is σ = 21612616626188. Its totient is φ = 21612616626186.

The previous prime is 21612616626179. The next prime is 21612616626229. The reversal of 21612616626187 is 78162661621612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21612616626187 - 2³ = 21612616626179 is a prime.

It is not a weakly prime, because it can be changed into another prime (21612616626487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10806308313093 + 10806308313094.

It is an arithmetic number, because the mean of its divisors is an integer number (10806308313094).

Almost surely, 2^{21612616626187} is an apocalyptic number.

21612616626187 is a deficient number, since it is larger than the sum of its proper divisors (1).

21612616626187 is an equidigital number, since it uses as much as digits as its factorization.

21612616626187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3483648, while the sum is 55.

The spelling of 21612616626187 in words is "twenty-one trillion, six hundred twelve billion, six hundred sixteen million, six hundred twenty-six thousand, one hundred eighty-seven".