21813907711 has 2 divisors, whose sum is σ = 21813907712. Its totient is φ = 21813907710.

The previous prime is 21813907679. The next prime is 21813907723. The reversal of 21813907711 is 11770931812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21813907711 - 2⁵ = 21813907679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21813907741) 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, 10906953855 + 10906953856.

It is an arithmetic number, because the mean of its divisors is an integer number (10906953856).

Almost surely, 2^21813907711 is an apocalyptic number.

21813907711 is a deficient number, since it is larger than the sum of its proper divisors (1).

21813907711 is an equidigital number, since it uses as much as digits as its factorization.

21813907711 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 40.

The spelling of 21813907711 in words is "twenty-one billion, eight hundred thirteen million, nine hundred seven thousand, seven hundred eleven".