7091321 has 4 divisors (see below), whose sum is σ = 7133952. Its totient is φ = 7048692.

The previous prime is 7091317. The next prime is 7091323. The reversal of 7091321 is 1231907.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1231907 = 43 ⋅28649.

It is a cyclic number.

It is not a de Polignac number, because 7091321 - 2² = 7091317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7091323) 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, 21065 + ... + 21398.

It is an arithmetic number, because the mean of its divisors is an integer number (1783488).

Almost surely, 2^7091321 is an apocalyptic number.

It is an amenable number.

7091321 is a deficient number, since it is larger than the sum of its proper divisors (42631).

7091321 is a wasteful number, since it uses less digits than its factorization.

7091321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42630.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 7091321 is about 2662.9534355674. The cubic root of 7091321 is about 192.1213877212.

The spelling of 7091321 in words is "seven million, ninety-one thousand, three hundred twenty-one".