42212189 has 2 divisors, whose sum is σ = 42212190. Its totient is φ = 42212188.

The previous prime is 42212171. The next prime is 42212237. The reversal of 42212189 is 98121224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21808900 + 20403289 = 4670^2 + 4517^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42212189 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42212689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21106094 + 21106095.

It is an arithmetic number, because the mean of its divisors is an integer number (21106095).

Almost surely, 2^42212189 is an apocalyptic number.

It is an amenable number.

42212189 is a deficient number, since it is larger than the sum of its proper divisors (1).

42212189 is an equidigital number, since it uses as much as digits as its factorization.

42212189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 29.

The square root of 42212189 is about 6497.0908105090. The cubic root of 42212189 is about 348.1870581294.

The spelling of 42212189 in words is "forty-two million, two hundred twelve thousand, one hundred eighty-nine".