1221220199 has 2 divisors, whose sum is σ = 1221220200. Its totient is φ = 1221220198.

The previous prime is 1221220163. The next prime is 1221220229. The reversal of 1221220199 is 9910221221.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221220199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221220499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610610099 + 610610100.

It is an arithmetic number, because the mean of its divisors is an integer number (610610100).

Almost surely, 2^1221220199 is an apocalyptic number.

1221220199 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221220199 is an equidigital number, since it uses as much as digits as its factorization.

1221220199 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 1221220199 is about 34945.9611257152. The cubic root of 1221220199 is about 1068.8858461249.

The spelling of 1221220199 in words is "one billion, two hundred twenty-one million, two hundred twenty thousand, one hundred ninety-nine".