42420321 has 16 divisors (see below), whose sum is σ = 66542400. Its totient is φ = 26616384.

The previous prime is 42420311. The next prime is 42420377. The reversal of 42420321 is 12302424.

42420321 is nontrivially palindromic in base 13.

It is not a de Polignac number, because 42420321 - 2⁹ = 42419809 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42420294 and 42420303.

It is not an unprimeable number, because it can be changed into a prime (42420311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45751 + ... + 46668.

It is an arithmetic number, because the mean of its divisors is an integer number (4158900).

Almost surely, 2^42420321 is an apocalyptic number.

It is an amenable number.

42420321 is a deficient number, since it is larger than the sum of its proper divisors (24122079).

42420321 is a wasteful number, since it uses less digits than its factorization.

42420321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92445 (or 92439 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 42420321 is about 6513.0884379072. The cubic root of 42420321 is about 348.7583788020.

Adding to 42420321 its reverse (12302424), we get a palindrome (54722745).

The spelling of 42420321 in words is "forty-two million, four hundred twenty thousand, three hundred twenty-one".