1222331221 has 2 divisors, whose sum is σ = 1222331222. Its totient is φ = 1222331220.

The previous prime is 1222331207. The next prime is 1222331249. The reversal of 1222331221 is 1221332221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 929579121 + 292752100 = 30489^2 + 17110^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222331221 - 2⁹ = 1222330709 is a prime.

It is a super-2 number, since 2×1222331221² = 2988187227662701682, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1222331291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611165610 + 611165611.

It is an arithmetic number, because the mean of its divisors is an integer number (611165611).

Almost surely, 2^1222331221 is an apocalyptic number.

It is an amenable number.

1222331221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222331221 is an equidigital number, since it uses as much as digits as its factorization.

1222331221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 19.

The square root of 1222331221 is about 34961.8537981040. The cubic root of 1222331221 is about 1069.2098924467.

Adding to 1222331221 its reverse (1221332221), we get a palindrome (2443663442).

The spelling of 1222331221 in words is "one billion, two hundred twenty-two million, three hundred thirty-one thousand, two hundred twenty-one".