7142321 has 2 divisors, whose sum is σ = 7142322. Its totient is φ = 7142320.

The previous prime is 7142299. The next prime is 7142341. The reversal of 7142321 is 1232417.

It is an a-pointer prime, because the next prime (7142341) can be obtained adding 7142321 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5290000 + 1852321 = 2300^2 + 1361^2 .

It is an emirp because it is prime and its reverse (1232417) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7142321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7142293 and 7142302.

It is not a weakly prime, because it can be changed into another prime (7142341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3571160 + 3571161.

It is an arithmetic number, because the mean of its divisors is an integer number (3571161).

Almost surely, 2^7142321 is an apocalyptic number.

It is an amenable number.

7142321 is a deficient number, since it is larger than the sum of its proper divisors (1).

7142321 is an equidigital number, since it uses as much as digits as its factorization.

7142321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 336, while the sum is 20.

The square root of 7142321 is about 2672.5121140979. The cubic root of 7142321 is about 192.5808599412.

Adding to 7142321 its reverse (1232417), we get a palindrome (8374738).

The spelling of 7142321 in words is "seven million, one hundred forty-two thousand, three hundred twenty-one".