222122261 has 2 divisors, whose sum is σ = 222122262. Its totient is φ = 222122260.

The previous prime is 222122249. The next prime is 222122267. The reversal of 222122261 is 162221222.

222122261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 219928900 + 2193361 = 14830^2 + 1481^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222122261 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222122267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111061130 + 111061131.

It is an arithmetic number, because the mean of its divisors is an integer number (111061131).

Almost surely, 2^222122261 is an apocalyptic number.

It is an amenable number.

222122261 is a deficient number, since it is larger than the sum of its proper divisors (1).

222122261 is an equidigital number, since it uses as much as digits as its factorization.

222122261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384, while the sum is 20.

The square root of 222122261 is about 14903.7666715498. The cubic root of 222122261 is about 605.6160298584.

Adding to 222122261 its reverse (162221222), we get a palindrome (384343483).

The spelling of 222122261 in words is "two hundred twenty-two million, one hundred twenty-two thousand, two hundred sixty-one".