21719322511 has 2 divisors, whose sum is σ = 21719322512. Its totient is φ = 21719322510.

The previous prime is 21719322481. The next prime is 21719322539. The reversal of 21719322511 is 11522391712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21719322511 - 2⁵ = 21719322479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21719322571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10859661255 + 10859661256.

It is an arithmetic number, because the mean of its divisors is an integer number (10859661256).

Almost surely, 2^21719322511 is an apocalyptic number.

21719322511 is a deficient number, since it is larger than the sum of its proper divisors (1).

21719322511 is an equidigital number, since it uses as much as digits as its factorization.

21719322511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 34.

The spelling of 21719322511 in words is "twenty-one billion, seven hundred nineteen million, three hundred twenty-two thousand, five hundred eleven".