239221421 has 2 divisors, whose sum is σ = 239221422. Its totient is φ = 239221420.

The previous prime is 239221397. The next prime is 239221441. The reversal of 239221421 is 124122932.

239221421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 225420196 + 13801225 = 15014^2 + 3715^2 .

It is a cyclic number.

It is not a de Polignac number, because 239221421 - 2⁶ = 239221357 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (239221441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119610710 + 119610711.

It is an arithmetic number, because the mean of its divisors is an integer number (119610711).

Almost surely, 2^239221421 is an apocalyptic number.

It is an amenable number.

239221421 is a deficient number, since it is larger than the sum of its proper divisors (1).

239221421 is an equidigital number, since it uses as much as digits as its factorization.

239221421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 26.

The square root of 239221421 is about 15466.7844427987. The cubic root of 239221421 is about 620.7737659808.

The spelling of 239221421 in words is "two hundred thirty-nine million, two hundred twenty-one thousand, four hundred twenty-one".