1222211251 has 2 divisors, whose sum is σ = 1222211252. Its totient is φ = 1222211250.

The previous prime is 1222211227. The next prime is 1222211257. The reversal of 1222211251 is 1521122221.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (1521122221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1222211251 - 2²⁹ = 685340339 is a prime.

It is a super-3 number, since 3×1222211251³ (a number of 28 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1222211257) 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, 611105625 + 611105626.

It is an arithmetic number, because the mean of its divisors is an integer number (611105626).

Almost surely, 2^1222211251 is an apocalyptic number.

1222211251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222211251 is an equidigital number, since it uses as much as digits as its factorization.

1222211251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 160, while the sum is 19.

The square root of 1222211251 is about 34960.1380289037. The cubic root of 1222211251 is about 1069.1749108461.

Adding to 1222211251 its reverse (1521122221), we get a palindrome (2743333472).

The spelling of 1222211251 in words is "one billion, two hundred twenty-two million, two hundred eleven thousand, two hundred fifty-one".