21281262959191 has 2 divisors, whose sum is σ = 21281262959192. Its totient is φ = 21281262959190.

The previous prime is 21281262959189. The next prime is 21281262959237. The reversal of 21281262959191 is 19195926218212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21281262959191 - 2¹ = 21281262959189 is a prime.

Together with 21281262959189, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21281262959141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10640631479595 + 10640631479596.

It is an arithmetic number, because the mean of its divisors is an integer number (10640631479596).

Almost surely, 2^{21281262959191} is an apocalyptic number.

21281262959191 is a deficient number, since it is larger than the sum of its proper divisors (1).

21281262959191 is an equidigital number, since it uses as much as digits as its factorization.

21281262959191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2799360, while the sum is 58.

The spelling of 21281262959191 in words is "twenty-one trillion, two hundred eighty-one billion, two hundred sixty-two million, nine hundred fifty-nine thousand, one hundred ninety-one".