199103299956721 has 2 divisors, whose sum is σ = 199103299956722. Its totient is φ = 199103299956720.

The previous prime is 199103299956647. The next prime is 199103299956731. The reversal of 199103299956721 is 127659992301991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 144709134899121 + 54394165057600 = 12029511^2 + 7375240^2 .

It is a cyclic number.

It is not a de Polignac number, because 199103299956721 - 2¹⁷ = 199103299825649 is a prime.

It is not a weakly prime, because it can be changed into another prime (199103299956731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99551649978360 + 99551649978361.

It is an arithmetic number, because the mean of its divisors is an integer number (99551649978361).

Almost surely, 2^{199103299956721} is an apocalyptic number.

It is an amenable number.

199103299956721 is a deficient number, since it is larger than the sum of its proper divisors (1).

199103299956721 is an equidigital number, since it uses as much as digits as its factorization.

199103299956721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 148803480, while the sum is 73.

The spelling of 199103299956721 in words is "one hundred ninety-nine trillion, one hundred three billion, two hundred ninety-nine million, nine hundred fifty-six thousand, seven hundred twenty-one".