222122981 has 2 divisors, whose sum is σ = 222122982. Its totient is φ = 222122980.

The previous prime is 222122959. The next prime is 222123001. The reversal of 222122981 is 189221222.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221712100 + 410881 = 14890^2 + 641^2 .

It is a cyclic number.

It is not a de Polignac number, because 222122981 - 2¹⁰ = 222121957 is a prime.

It is a super-2 number, since 2×222122981² = 98677237376652722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222122911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111061490 + 111061491.

It is an arithmetic number, because the mean of its divisors is an integer number (111061491).

Almost surely, 2^222122981 is an apocalyptic number.

It is an amenable number.

222122981 is a deficient number, since it is larger than the sum of its proper divisors (1).

222122981 is an equidigital number, since it uses as much as digits as its factorization.

222122981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 29.

The square root of 222122981 is about 14903.7908264978. The cubic root of 222122981 is about 605.6166842174.

The spelling of 222122981 in words is "two hundred twenty-two million, one hundred twenty-two thousand, nine hundred eighty-one".