21907256093 has 2 divisors, whose sum is σ = 21907256094. Its totient is φ = 21907256092.

The previous prime is 21907256069. The next prime is 21907256149. The reversal of 21907256093 is 39065270912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16251915289 + 5655340804 = 127483^2 + 75202^2 .

It is a cyclic number.

It is not a de Polignac number, because 21907256093 - 2⁶ = 21907256029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21907256003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10953628046 + 10953628047.

It is an arithmetic number, because the mean of its divisors is an integer number (10953628047).

Almost surely, 2^21907256093 is an apocalyptic number.

It is an amenable number.

21907256093 is a deficient number, since it is larger than the sum of its proper divisors (1).

21907256093 is an equidigital number, since it uses as much as digits as its factorization.

21907256093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 204120, while the sum is 44.

The spelling of 21907256093 in words is "twenty-one billion, nine hundred seven million, two hundred fifty-six thousand, ninety-three".