42930221 has 4 divisors (see below), whose sum is σ = 43534944. Its totient is φ = 42325500.

The previous prime is 42930203. The next prime is 42930233. The reversal of 42930221 is 12203924.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42930221 - 2¹⁰ = 42929197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42930241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 302255 + ... + 302396.

It is an arithmetic number, because the mean of its divisors is an integer number (10883736).

Almost surely, 2^42930221 is an apocalyptic number.

It is an amenable number.

42930221 is a deficient number, since it is larger than the sum of its proper divisors (604723).

42930221 is an equidigital number, since it uses as much as digits as its factorization.

42930221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604722.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 42930221 is about 6552.1157651556. The cubic root of 42930221 is about 350.1501967608.

The spelling of 42930221 in words is "forty-two million, nine hundred thirty thousand, two hundred twenty-one".