221001221099 has 2 divisors, whose sum is σ = 221001221100. Its totient is φ = 221001221098.

The previous prime is 221001221087. The next prime is 221001221159. The reversal of 221001221099 is 990122100122.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221001221099 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (221001221039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110500610549 + 110500610550.

It is an arithmetic number, because the mean of its divisors is an integer number (110500610550).

Almost surely, 2^221001221099 is an apocalyptic number.

221001221099 is a deficient number, since it is larger than the sum of its proper divisors (1).

221001221099 is an equidigital number, since it uses as much as digits as its factorization.

221001221099 is an odious number, because the sum of its binary digits is odd.

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

The spelling of 221001221099 in words is "two hundred twenty-one billion, one million, two hundred twenty-one thousand, ninety-nine".