221326139 has 2 divisors, whose sum is σ = 221326140. Its totient is φ = 221326138.

The previous prime is 221326123. The next prime is 221326181. The reversal of 221326139 is 931623122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221326139 - 2⁴ = 221326123 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (221326109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110663069 + 110663070.

It is an arithmetic number, because the mean of its divisors is an integer number (110663070).

Almost surely, 2^221326139 is an apocalyptic number.

221326139 is a deficient number, since it is larger than the sum of its proper divisors (1).

221326139 is an equidigital number, since it uses as much as digits as its factorization.

221326139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 29.

The square root of 221326139 is about 14877.0339449771. The cubic root of 221326139 is about 604.8916218679.

The spelling of 221326139 in words is "two hundred twenty-one million, three hundred twenty-six thousand, one hundred thirty-nine".