22775639021 has 2 divisors, whose sum is σ = 22775639022. Its totient is φ = 22775639020.

The previous prime is 22775639009. The next prime is 22775639083. The reversal of 22775639021 is 12093657722.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18167265796 + 4608373225 = 134786^2 + 67885^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22775639021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22775636021) 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, 11387819510 + 11387819511.

It is an arithmetic number, because the mean of its divisors is an integer number (11387819511).

Almost surely, 2^22775639021 is an apocalyptic number.

It is an amenable number.

22775639021 is a deficient number, since it is larger than the sum of its proper divisors (1).

22775639021 is an equidigital number, since it uses as much as digits as its factorization.

22775639021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 317520, while the sum is 44.

The spelling of 22775639021 in words is "twenty-two billion, seven hundred seventy-five million, six hundred thirty-nine thousand, twenty-one".