21907151249 has 2 divisors, whose sum is σ = 21907151250. Its totient is φ = 21907151248.

The previous prime is 21907151137. The next prime is 21907151309. The reversal of 21907151249 is 94215170912.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19752334849 + 2154816400 = 140543^2 + 46420^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21907151249 is a prime.

It is not a weakly prime, because it can be changed into another prime (21904151249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10953575624 + 10953575625.

It is an arithmetic number, because the mean of its divisors is an integer number (10953575625).

Almost surely, 2^21907151249 is an apocalyptic number.

It is an amenable number.

21907151249 is a deficient number, since it is larger than the sum of its proper divisors (1).

21907151249 is an equidigital number, since it uses as much as digits as its factorization.

21907151249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 41.

The spelling of 21907151249 in words is "twenty-one billion, nine hundred seven million, one hundred fifty-one thousand, two hundred forty-nine".