221213099 has 2 divisors, whose sum is σ = 221213100. Its totient is φ = 221213098.

The previous prime is 221213093. The next prime is 221213123. The reversal of 221213099 is 990312122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221213099 - 2²⁰ = 220164523 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (221213093) 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, 110606549 + 110606550.

It is an arithmetic number, because the mean of its divisors is an integer number (110606550).

Almost surely, 2^221213099 is an apocalyptic number.

221213099 is a deficient number, since it is larger than the sum of its proper divisors (1).

221213099 is an equidigital number, since it uses as much as digits as its factorization.

221213099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 221213099 is about 14873.2343153734. The cubic root of 221213099 is about 604.7886236508.

It can be divided in two parts, 22 and 1213099, that added together give a palindrome (1213121).

The spelling of 221213099 in words is "two hundred twenty-one million, two hundred thirteen thousand, ninety-nine".