222221137 has 2 divisors, whose sum is σ = 222221138. Its totient is φ = 222221136.

The previous prime is 222221071. The next prime is 222221143. The reversal of 222221137 is 731122222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 217385536 + 4835601 = 14744^2 + 2199^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222221137 is a prime.

It is not a weakly prime, because it can be changed into another prime (222221437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111110568 + 111110569.

It is an arithmetic number, because the mean of its divisors is an integer number (111110569).

Almost surely, 2^222221137 is an apocalyptic number.

It is an amenable number.

222221137 is a deficient number, since it is larger than the sum of its proper divisors (1).

222221137 is an equidigital number, since it uses as much as digits as its factorization.

222221137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 672, while the sum is 22.

The square root of 222221137 is about 14907.0834504943. The cubic root of 222221137 is about 605.7058782860.

Adding to 222221137 its reverse (731122222), we get a palindrome (953343359).

The spelling of 222221137 in words is "two hundred twenty-two million, two hundred twenty-one thousand, one hundred thirty-seven".