21899418907 has 2 divisors, whose sum is σ = 21899418908. Its totient is φ = 21899418906.

The previous prime is 21899418883. The next prime is 21899418913. The reversal of 21899418907 is 70981499812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21899418907 - 2²⁷ = 21765201179 is a prime.

It is not a weakly prime, because it can be changed into another prime (21899418977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10949709453 + 10949709454.

It is an arithmetic number, because the mean of its divisors is an integer number (10949709454).

Almost surely, 2^21899418907 is an apocalyptic number.

21899418907 is a deficient number, since it is larger than the sum of its proper divisors (1).

21899418907 is an equidigital number, since it uses as much as digits as its factorization.

21899418907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2612736, while the sum is 58.

The spelling of 21899418907 in words is "twenty-one billion, eight hundred ninety-nine million, four hundred eighteen thousand, nine hundred seven".