22201210261 has 2 divisors, whose sum is σ = 22201210262. Its totient is φ = 22201210260.

The previous prime is 22201210247. The next prime is 22201210301. The reversal of 22201210261 is 16201210222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18877111236 + 3324099025 = 137394^2 + 57655^2 .

It is a cyclic number.

It is not a de Polignac number, because 22201210261 - 2⁷ = 22201210133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22201210211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11100605130 + 11100605131.

It is an arithmetic number, because the mean of its divisors is an integer number (11100605131).

Almost surely, 2^22201210261 is an apocalyptic number.

It is an amenable number.

22201210261 is a deficient number, since it is larger than the sum of its proper divisors (1).

22201210261 is an equidigital number, since it uses as much as digits as its factorization.

22201210261 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 22201210261 its reverse (16201210222), we get a palindrome (38402420483).

The spelling of 22201210261 in words is "twenty-two billion, two hundred one million, two hundred ten thousand, two hundred sixty-one".