21255872281207 has 2 divisors, whose sum is σ = 21255872281208. Its totient is φ = 21255872281206.

The previous prime is 21255872281153. The next prime is 21255872281229. The reversal of 21255872281207 is 70218227855212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21255872281207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21255872281277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10627936140603 + 10627936140604.

It is an arithmetic number, because the mean of its divisors is an integer number (10627936140604).

Almost surely, 2^{21255872281207} is an apocalyptic number.

21255872281207 is a deficient number, since it is larger than the sum of its proper divisors (1).

21255872281207 is an equidigital number, since it uses as much as digits as its factorization.

21255872281207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2508800, while the sum is 52.

The spelling of 21255872281207 in words is "twenty-one trillion, two hundred fifty-five billion, eight hundred seventy-two million, two hundred eighty-one thousand, two hundred seven".