21612485836807 has 2 divisors, whose sum is σ = 21612485836808. Its totient is φ = 21612485836806.

The previous prime is 21612485836771. The next prime is 21612485836829. The reversal of 21612485836807 is 70863858421612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21612485836807 - 2⁷ = 21612485836679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21612485836307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10806242918403 + 10806242918404.

It is an arithmetic number, because the mean of its divisors is an integer number (10806242918404).

Almost surely, 2^{21612485836807} is an apocalyptic number.

21612485836807 is a deficient number, since it is larger than the sum of its proper divisors (1).

21612485836807 is an equidigital number, since it uses as much as digits as its factorization.

21612485836807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30965760, while the sum is 61.

The spelling of 21612485836807 in words is "twenty-one trillion, six hundred twelve billion, four hundred eighty-five million, eight hundred thirty-six thousand, eight hundred seven".