7122131321 has 4 divisors (see below), whose sum is σ = 7127319972. Its totient is φ = 7116942672.

The previous prime is 7122131287. The next prime is 7122131333. The reversal of 7122131321 is 1231312217.

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 5270034025 + 1852097296 = 72595^2 + 43036^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7122131321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7122136321) 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, 2592266 + ... + 2595011.

It is an arithmetic number, because the mean of its divisors is an integer number (1781829993).

Almost surely, 2^7122131321 is an apocalyptic number.

It is an amenable number.

7122131321 is a deficient number, since it is larger than the sum of its proper divisors (5188651).

7122131321 is a wasteful number, since it uses less digits than its factorization.

7122131321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5188650.

The product of its digits is 504, while the sum is 23.

The square root of 7122131321 is about 84392.7207820675. The cubic root of 7122131321 is about 1923.9922826824.

Adding to 7122131321 its reverse (1231312217), we get a palindrome (8353443538).

The spelling of 7122131321 in words is "seven billion, one hundred twenty-two million, one hundred thirty-one thousand, three hundred twenty-one".