22755055721 has 2 divisors, whose sum is σ = 22755055722. Its totient is φ = 22755055720.

The previous prime is 22755055717. The next prime is 22755055723. The reversal of 22755055721 is 12755055722.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16785793600 + 5969262121 = 129560^2 + 77261^2 .

It is a cyclic number.

It is not a de Polignac number, because 22755055721 - 2² = 22755055717 is a prime.

Together with 22755055723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22755055723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11377527860 + 11377527861.

It is an arithmetic number, because the mean of its divisors is an integer number (11377527861).

Almost surely, 2^22755055721 is an apocalyptic number.

It is an amenable number.

22755055721 is a deficient number, since it is larger than the sum of its proper divisors (1).

22755055721 is an equidigital number, since it uses as much as digits as its factorization.

22755055721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 245000, while the sum is 41.

Subtracting from 22755055721 its reverse (12755055722), we obtain a palindrome (9999999999).

The spelling of 22755055721 in words is "twenty-two billion, seven hundred fifty-five million, fifty-five thousand, seven hundred twenty-one".