22221302261 has 2 divisors, whose sum is σ = 22221302262. Its totient is φ = 22221302260.

The previous prime is 22221302203. The next prime is 22221302263. The reversal of 22221302261 is 16220312222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20276051236 + 1945251025 = 142394^2 + 44105^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22221302261 is a prime.

Together with 22221302263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22221302263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11110651130 + 11110651131.

It is an arithmetic number, because the mean of its divisors is an integer number (11110651131).

Almost surely, 2^22221302261 is an apocalyptic number.

It is an amenable number.

22221302261 is a deficient number, since it is larger than the sum of its proper divisors (1).

22221302261 is an equidigital number, since it uses as much as digits as its factorization.

22221302261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 22221302261 its reverse (16220312222), we get a palindrome (38441614483).

The spelling of 22221302261 in words is "twenty-two billion, two hundred twenty-one million, three hundred two thousand, two hundred sixty-one".