1222245221 has 2 divisors, whose sum is σ = 1222245222. Its totient is φ = 1222245220.

The previous prime is 1222245217. The next prime is 1222245229. The reversal of 1222245221 is 1225422221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1023040225 + 199204996 = 31985^2 + 14114^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222245221 - 2² = 1222245217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1222245229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611122610 + 611122611.

It is an arithmetic number, because the mean of its divisors is an integer number (611122611).

Almost surely, 2^1222245221 is an apocalyptic number.

It is an amenable number.

1222245221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222245221 is an equidigital number, since it uses as much as digits as its factorization.

1222245221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1280, while the sum is 23.

The square root of 1222245221 is about 34960.6238645708. The cubic root of 1222245221 is about 1069.1848162628.

Adding to 1222245221 its reverse (1225422221), we get a palindrome (2447667442).

The spelling of 1222245221 in words is "one billion, two hundred twenty-two million, two hundred forty-five thousand, two hundred twenty-one".