42919321 has 4 divisors (see below), whose sum is σ = 43299252. Its totient is φ = 42539392.

The previous prime is 42919313. The next prime is 42919343. The reversal of 42919321 is 12391924.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22992025 + 19927296 = 4795^2 + 4464^2 .

It is a cyclic number.

It is not a de Polignac number, because 42919321 - 2³ = 42919313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42919351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189796 + ... + 190021.

It is an arithmetic number, because the mean of its divisors is an integer number (10824813).

Almost surely, 2^42919321 is an apocalyptic number.

It is an amenable number.

42919321 is a deficient number, since it is larger than the sum of its proper divisors (379931).

42919321 is a wasteful number, since it uses less digits than its factorization.

42919321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379930.

The product of its digits is 3888, while the sum is 31.

The square root of 42919321 is about 6551.2839199656. The cubic root of 42919321 is about 350.1205598281.

The spelling of 42919321 in words is "forty-two million, nine hundred nineteen thousand, three hundred twenty-one".