7320719621 has 4 divisors (see below), whose sum is σ = 7323456972. Its totient is φ = 7317982272.

The previous prime is 7320719579. The next prime is 7320719633. The reversal of 7320719621 is 1269170237.

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 3553828996 + 3766890625 = 59614^2 + 61375^2 .

It is a cyclic number.

It is not a de Polignac number, because 7320719621 - 2¹⁴ = 7320703237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7320719641) 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, 1364660 + ... + 1370013.

It is an arithmetic number, because the mean of its divisors is an integer number (1830864243).

Almost surely, 2^7320719621 is an apocalyptic number.

It is an amenable number.

7320719621 is a deficient number, since it is larger than the sum of its proper divisors (2737351).

7320719621 is a wasteful number, since it uses less digits than its factorization.

7320719621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2737350.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 7320719621 is about 85561.2039478174. The cubic root of 7320719621 is about 1941.7110016815.

Adding to 7320719621 its reverse (1269170237), we get a palindrome (8589889858).

The spelling of 7320719621 in words is "seven billion, three hundred twenty million, seven hundred nineteen thousand, six hundred twenty-one".