221339999 has 2 divisors, whose sum is σ = 221340000. Its totient is φ = 221339998.

The previous prime is 221339959. The next prime is 221340019. The reversal of 221339999 is 999933122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221339999 - 2⁸ = 221339743 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221339959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110669999 + 110670000.

It is an arithmetic number, because the mean of its divisors is an integer number (110670000).

Almost surely, 2^221339999 is an apocalyptic number.

221339999 is a deficient number, since it is larger than the sum of its proper divisors (1).

221339999 is an equidigital number, since it uses as much as digits as its factorization.

221339999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 236196, while the sum is 47.

The square root of 221339999 is about 14877.4997563435. The cubic root of 221339999 is about 604.9042482164.

The spelling of 221339999 in words is "two hundred twenty-one million, three hundred thirty-nine thousand, nine hundred ninety-nine".