42209971 has 2 divisors, whose sum is σ = 42209972. Its totient is φ = 42209970.

The previous prime is 42209897. The next prime is 42209977. The reversal of 42209971 is 17990224.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42209971 - 2¹⁵ = 42177203 is a prime.

It is not a weakly prime, because it can be changed into another prime (42209977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21104985 + 21104986.

It is an arithmetic number, because the mean of its divisors is an integer number (21104986).

Almost surely, 2^42209971 is an apocalyptic number.

42209971 is a deficient number, since it is larger than the sum of its proper divisors (1).

42209971 is an equidigital number, since it uses as much as digits as its factorization.

42209971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 42209971 is about 6496.9201164860. The cubic root of 42209971 is about 348.1809596348.

The spelling of 42209971 in words is "forty-two million, two hundred nine thousand, nine hundred seventy-one".