42221239 has 2 divisors, whose sum is σ = 42221240. Its totient is φ = 42221238.

The previous prime is 42221219. The next prime is 42221243. The reversal of 42221239 is 93212224.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42221239 - 2²¹ = 40124087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42221209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21110619 + 21110620.

It is an arithmetic number, because the mean of its divisors is an integer number (21110620).

Almost surely, 2^42221239 is an apocalyptic number.

42221239 is a deficient number, since it is larger than the sum of its proper divisors (1).

42221239 is an equidigital number, since it uses as much as digits as its factorization.

42221239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 25.

The square root of 42221239 is about 6497.7872387452. The cubic root of 42221239 is about 348.2119393133.

The spelling of 42221239 in words is "forty-two million, two hundred twenty-one thousand, two hundred thirty-nine".