22135500221 has 2 divisors, whose sum is σ = 22135500222. Its totient is φ = 22135500220.

The previous prime is 22135500203. The next prime is 22135500227. The reversal of 22135500221 is 12200553122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12157488121 + 9978012100 = 110261^2 + 99890^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22135500221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22135500227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11067750110 + 11067750111.

It is an arithmetic number, because the mean of its divisors is an integer number (11067750111).

Almost surely, 2^22135500221 is an apocalyptic number.

It is an amenable number.

22135500221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22135500221 is an equidigital number, since it uses as much as digits as its factorization.

22135500221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 23.

The spelling of 22135500221 in words is "twenty-two billion, one hundred thirty-five million, five hundred thousand, two hundred twenty-one".