1222221109 has 2 divisors, whose sum is σ = 1222221110. Its totient is φ = 1222221108.

The previous prime is 1222221083. The next prime is 1222221139. The reversal of 1222221109 is 9011222221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 974064100 + 248157009 = 31210^2 + 15753^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1222221109 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1222221109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1222221139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611110554 + 611110555.

It is an arithmetic number, because the mean of its divisors is an integer number (611110555).

Almost surely, 2^1222221109 is an apocalyptic number.

It is an amenable number.

1222221109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222221109 is an equidigital number, since it uses as much as digits as its factorization.

1222221109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 1222221109 is about 34960.2790177653. The cubic root of 1222221109 is about 1069.1777853896.

The spelling of 1222221109 in words is "one billion, two hundred twenty-two million, two hundred twenty-one thousand, one hundred nine".