21122838907 has 2 divisors, whose sum is σ = 21122838908. Its totient is φ = 21122838906.

The previous prime is 21122838871. The next prime is 21122838937. The reversal of 21122838907 is 70983822112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21122838907 is a prime.

It is not a weakly prime, because it can be changed into another prime (21122838937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561419453 + 10561419454.

It is an arithmetic number, because the mean of its divisors is an integer number (10561419454).

Almost surely, 2^21122838907 is an apocalyptic number.

21122838907 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122838907 is an equidigital number, since it uses as much as digits as its factorization.

21122838907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 43.

The spelling of 21122838907 in words is "twenty-one billion, one hundred twenty-two million, eight hundred thirty-eight thousand, nine hundred seven".