22120012261 has 2 divisors, whose sum is σ = 22120012262. Its totient is φ = 22120012260.

The previous prime is 22120012259. The next prime is 22120012331. The reversal of 22120012261 is 16221002122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20115748900 + 2004263361 = 141830^2 + 44769^2 .

It is a cyclic number.

It is not a de Polignac number, because 22120012261 - 2¹ = 22120012259 is a prime.

Together with 22120012259, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22120012231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11060006130 + 11060006131.

It is an arithmetic number, because the mean of its divisors is an integer number (11060006131).

Almost surely, 2^22120012261 is an apocalyptic number.

It is an amenable number.

22120012261 is a deficient number, since it is larger than the sum of its proper divisors (1).

22120012261 is an equidigital number, since it uses as much as digits as its factorization.

22120012261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 22120012261 its reverse (16221002122), we get a palindrome (38341014383).

The spelling of 22120012261 in words is "twenty-two billion, one hundred twenty million, twelve thousand, two hundred sixty-one".