1221010199 has 2 divisors, whose sum is σ = 1221010200. Its totient is φ = 1221010198.

The previous prime is 1221010181. The next prime is 1221010201. The reversal of 1221010199 is 9910101221.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221010199 is a prime.

Together with 1221010201, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221018199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610505099 + 610505100.

It is an arithmetic number, because the mean of its divisors is an integer number (610505100).

Almost surely, 2^1221010199 is an apocalyptic number.

1221010199 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221010199 is an equidigital number, since it uses as much as digits as its factorization.

1221010199 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 26.

The square root of 1221010199 is about 34942.9563574692. The cubic root of 1221010199 is about 1068.8245743752.

The spelling of 1221010199 in words is "one billion, two hundred twenty-one million, ten thousand, one hundred ninety-nine".