221081299 has 2 divisors, whose sum is σ = 221081300. Its totient is φ = 221081298.

The previous prime is 221081293. The next prime is 221081317. The reversal of 221081299 is 992180122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221081299 - 2¹⁷ = 220950227 is a prime.

It is not a weakly prime, because it can be changed into another prime (221081293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110540649 + 110540650.

It is an arithmetic number, because the mean of its divisors is an integer number (110540650).

Almost surely, 2^221081299 is an apocalyptic number.

221081299 is a deficient number, since it is larger than the sum of its proper divisors (1).

221081299 is an equidigital number, since it uses as much as digits as its factorization.

221081299 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 221081299 is about 14868.8028771653. The cubic root of 221081299 is about 604.6684876417.

The spelling of 221081299 in words is "two hundred twenty-one million, eighty-one thousand, two hundred ninety-nine".