42222139 has 2 divisors, whose sum is σ = 42222140. Its totient is φ = 42222138.

The previous prime is 42222119. The next prime is 42222221. The reversal of 42222139 is 93122224.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42222139 - 2⁵ = 42222107 is a prime.

It is not a weakly prime, because it can be changed into another prime (42222119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21111069 + 21111070.

It is an arithmetic number, because the mean of its divisors is an integer number (21111070).

Almost surely, 2^42222139 is an apocalyptic number.

42222139 is a deficient number, since it is larger than the sum of its proper divisors (1).

42222139 is an equidigital number, since it uses as much as digits as its factorization.

42222139 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 42222139 is about 6497.8564927213. The cubic root of 42222139 is about 348.2144134908.

The spelling of 42222139 in words is "forty-two million, two hundred twenty-two thousand, one hundred thirty-nine".