21022331009 has 2 divisors, whose sum is σ = 21022331010. Its totient is φ = 21022331008.

The previous prime is 21022330937. The next prime is 21022331023. The reversal of 21022331009 is 90013322012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14859610000 + 6162721009 = 121900^2 + 78503^2 .

It is a cyclic number.

It is not a de Polignac number, because 21022331009 - 2²⁰ = 21021282433 is a prime.

It is not a weakly prime, because it can be changed into another prime (21022331059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511165504 + 10511165505.

It is an arithmetic number, because the mean of its divisors is an integer number (10511165505).

Almost surely, 2^21022331009 is an apocalyptic number.

It is an amenable number.

21022331009 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022331009 is an equidigital number, since it uses as much as digits as its factorization.

21022331009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

The spelling of 21022331009 in words is "twenty-one billion, twenty-two million, three hundred thirty-one thousand, nine".