30221239 has 2 divisors, whose sum is σ = 30221240. Its totient is φ = 30221238.

The previous prime is 30221209. The next prime is 30221251. The reversal of 30221239 is 93212203.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 30221239 - 2⁵ = 30221207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30221209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15110619 + 15110620.

It is an arithmetic number, because the mean of its divisors is an integer number (15110620).

Almost surely, 2^30221239 is an apocalyptic number.

30221239 is a deficient number, since it is larger than the sum of its proper divisors (1).

30221239 is an equidigital number, since it uses as much as digits as its factorization.

30221239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 30221239 is about 5497.3847418568. The cubic root of 30221239 is about 311.4852039585.

The spelling of 30221239 in words is "thirty million, two hundred twenty-one thousand, two hundred thirty-nine".