21616006868047 has 2 divisors, whose sum is σ = 21616006868048. Its totient is φ = 21616006868046.

The previous prime is 21616006867967. The next prime is 21616006868111. The reversal of 21616006868047 is 74086860061612.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21616006868047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21616006863047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10808003434023 + 10808003434024.

It is an arithmetic number, because the mean of its divisors is an integer number (10808003434024).

Almost surely, 2^{21616006868047} is an apocalyptic number.

21616006868047 is a deficient number, since it is larger than the sum of its proper divisors (1).

21616006868047 is an equidigital number, since it uses as much as digits as its factorization.

21616006868047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4644864, while the sum is 55.

The spelling of 21616006868047 in words is "twenty-one trillion, six hundred sixteen billion, six million, eight hundred sixty-eight thousand, forty-seven".