21616006168051 has 2 divisors, whose sum is σ = 21616006168052. Its totient is φ = 21616006168050.

The previous prime is 21616006168049. The next prime is 21616006168063. The reversal of 21616006168051 is 15086160061612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21616006168051 - 2¹ = 21616006168049 is a prime.

Together with 21616006168049, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 21616006167989 and 21616006168007.

It is not a weakly prime, because it can be changed into another prime (21616006108051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10808003084025 + 10808003084026.

It is an arithmetic number, because the mean of its divisors is an integer number (10808003084026).

Almost surely, 2^{21616006168051} is an apocalyptic number.

21616006168051 is a deficient number, since it is larger than the sum of its proper divisors (1).

21616006168051 is an equidigital number, since it uses as much as digits as its factorization.

21616006168051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 43.

The spelling of 21616006168051 in words is "twenty-one trillion, six hundred sixteen billion, six million, one hundred sixty-eight thousand, fifty-one".