7042321 has 20 divisors (see below), whose sum is σ = 8567860. Its totient is φ = 5749920.

The previous prime is 7042319. The next prime is 7042327. The reversal of 7042321 is 1232407.

It can be written as a sum of positive squares in 2 ways, for example, as 3748096 + 3294225 = 1936^2 + 1815^2 .

It is not a de Polignac number, because 7042321 - 2¹ = 7042319 is a prime.

It is a Duffinian number.

7042321 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7042327) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 190315 + ... + 190351.

It is an arithmetic number, because the mean of its divisors is an integer number (428393).

Almost surely, 2^7042321 is an apocalyptic number.

It is an amenable number.

7042321 is a deficient number, since it is larger than the sum of its proper divisors (1525539).

7042321 is an equidigital number, since it uses as much as digits as its factorization.

7042321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94 (or 61 counting only the distinct ones).

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

The square root of 7042321 is about 2653.7371761348. The cubic root of 7042321 is about 191.6778542514.

Adding to 7042321 its reverse (1232407), we get a palindrome (8274728).

It can be divided in two parts, 704 and 2321, that added together give a square (3025 = 55²).

The spelling of 7042321 in words is "seven million, forty-two thousand, three hundred twenty-one".