1221152099 has 2 divisors, whose sum is σ = 1221152100. Its totient is φ = 1221152098.

The previous prime is 1221152083. The next prime is 1221152111. The reversal of 1221152099 is 9902511221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221152099 - 2⁴ = 1221152083 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1221152029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610576049 + 610576050.

It is an arithmetic number, because the mean of its divisors is an integer number (610576050).

Almost surely, 2^1221152099 is an apocalyptic number.

1221152099 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221152099 is an equidigital number, since it uses as much as digits as its factorization.

1221152099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 32.

The square root of 1221152099 is about 34944.9867506056. The cubic root of 1221152099 is about 1068.8659773414.

The spelling of 1221152099 in words is "one billion, two hundred twenty-one million, one hundred fifty-two thousand, ninety-nine".