39221971 has 2 divisors, whose sum is σ = 39221972. Its totient is φ = 39221970.

The previous prime is 39221939. The next prime is 39221983. The reversal of 39221971 is 17912293.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 39221971 - 2⁵ = 39221939 is a prime.

It is not a weakly prime, because it can be changed into another prime (39221471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19610985 + 19610986.

It is an arithmetic number, because the mean of its divisors is an integer number (19610986).

Almost surely, 2^39221971 is an apocalyptic number.

39221971 is a deficient number, since it is larger than the sum of its proper divisors (1).

39221971 is an equidigital number, since it uses as much as digits as its factorization.

39221971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6804, while the sum is 34.

The square root of 39221971 is about 6262.7446858386. The cubic root of 39221971 is about 339.7633041171.

The spelling of 39221971 in words is "thirty-nine million, two hundred twenty-one thousand, nine hundred seventy-one".