42932221 has 2 divisors, whose sum is σ = 42932222. Its totient is φ = 42932220.

The previous prime is 42932177. The next prime is 42932243. The reversal of 42932221 is 12223924.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33235225 + 9696996 = 5765^2 + 3114^2 .

It is a cyclic number.

It is not a de Polignac number, because 42932221 - 2¹⁵ = 42899453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42932251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21466110 + 21466111.

It is an arithmetic number, because the mean of its divisors is an integer number (21466111).

Almost surely, 2^42932221 is an apocalyptic number.

It is an amenable number.

42932221 is a deficient number, since it is larger than the sum of its proper divisors (1).

42932221 is an equidigital number, since it uses as much as digits as its factorization.

42932221 is an odious number, because the sum of its binary digits is odd.

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

The square root of 42932221 is about 6552.2683858340. The cubic root of 42932221 is about 350.1556341854.

The spelling of 42932221 in words is "forty-two million, nine hundred thirty-two thousand, two hundred twenty-one".