42007321 has 4 divisors (see below), whose sum is σ = 43142692. Its totient is φ = 40871952.

The previous prime is 42007319. The next prime is 42007333. The reversal of 42007321 is 12370024.

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 34105600 + 7901721 = 5840^2 + 2811^2 .

It is a cyclic number.

It is not a de Polignac number, because 42007321 - 2¹ = 42007319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42007621) 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, 567630 + ... + 567703.

It is an arithmetic number, because the mean of its divisors is an integer number (10785673).

Almost surely, 2^42007321 is an apocalyptic number.

It is an amenable number.

42007321 is a deficient number, since it is larger than the sum of its proper divisors (1135371).

42007321 is a wasteful number, since it uses less digits than its factorization.

42007321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1135370.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 42007321 is about 6481.3055012088. The cubic root of 42007321 is about 347.6228601336.

Adding to 42007321 its reverse (12370024), we get a palindrome (54377345).

The spelling of 42007321 in words is "forty-two million, seven thousand, three hundred twenty-one".