21322020911 has 2 divisors, whose sum is σ = 21322020912. Its totient is φ = 21322020910.

The previous prime is 21322020887. The next prime is 21322020917. The reversal of 21322020911 is 11902022312.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21322020911 - 2¹⁸ = 21321758767 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21322020917) 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, 10661010455 + 10661010456.

It is an arithmetic number, because the mean of its divisors is an integer number (10661010456).

Almost surely, 2^21322020911 is an apocalyptic number.

21322020911 is a deficient number, since it is larger than the sum of its proper divisors (1).

21322020911 is an equidigital number, since it uses as much as digits as its factorization.

21322020911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

The spelling of 21322020911 in words is "twenty-one billion, three hundred twenty-two million, twenty thousand, nine hundred eleven".