42345921 has 12 divisors (see below), whose sum is σ = 59025008. Its totient is φ = 27002184.

The previous prime is 42345917. The next prime is 42345971. The reversal of 42345921 is 12954324.

It is not a de Polignac number, because 42345921 - 2² = 42345917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42345911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11755 + ... + 14928.

Almost surely, 2^42345921 is an apocalyptic number.

It is an amenable number.

42345921 is a deficient number, since it is larger than the sum of its proper divisors (16679087).

42345921 is a wasteful number, since it uses less digits than its factorization.

42345921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26732 (or 26709 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

The square root of 42345921 is about 6507.3743552988. The cubic root of 42345921 is about 348.5543664544.

The spelling of 42345921 in words is "forty-two million, three hundred forty-five thousand, nine hundred twenty-one".