21907151309 has 2 divisors, whose sum is σ = 21907151310. Its totient is φ = 21907151308.

The previous prime is 21907151249. The next prime is 21907151333. The reversal of 21907151309 is 90315170912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11635936900 + 10271214409 = 107870^2 + 101347^2 .

It is a cyclic number.

It is not a de Polignac number, because 21907151309 - 2⁸ = 21907151053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21907151509) 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, 10953575654 + 10953575655.

It is an arithmetic number, because the mean of its divisors is an integer number (10953575655).

Almost surely, 2^21907151309 is an apocalyptic number.

It is an amenable number.

21907151309 is a deficient number, since it is larger than the sum of its proper divisors (1).

21907151309 is an equidigital number, since it uses as much as digits as its factorization.

21907151309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17010, while the sum is 38.

The spelling of 21907151309 in words is "twenty-one billion, nine hundred seven million, one hundred fifty-one thousand, three hundred nine".