221122012261 has 2 divisors, whose sum is σ = 221122012262. Its totient is φ = 221122012260.

The previous prime is 221122012183. The next prime is 221122012277. The reversal of 221122012261 is 162210221122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 168669561636 + 52452450625 = 410694^2 + 229025^2 .

It is a cyclic number.

It is not a de Polignac number, because 221122012261 - 2¹⁵ = 221121979493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221122012561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110561006130 + 110561006131.

It is an arithmetic number, because the mean of its divisors is an integer number (110561006131).

Almost surely, 2^221122012261 is an apocalyptic number.

It is an amenable number.

221122012261 is a deficient number, since it is larger than the sum of its proper divisors (1).

221122012261 is an equidigital number, since it uses as much as digits as its factorization.

221122012261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 221122012261 its reverse (162210221122), we get a palindrome (383332233383).

The spelling of 221122012261 in words is "two hundred twenty-one billion, one hundred twenty-two million, twelve thousand, two hundred sixty-one".