7337806921 has 3 divisors (see below), whose sum is σ = 7337892583. Its totient is φ = 7337721260.

The previous prime is 7337806873. The next prime is 7337806933. The reversal of 7337806921 is 1296087337.

It is a happy number.

The square root of 7337806921 is 85661.

It is a perfect power (a square), and thus also a powerful number.

7337806921 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 405579321 + 6932227600 = 20139^2 + 83260^2 .

It is not a de Polignac number, because 7337806921 - 2⁹ = 7337806409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7337806961) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 42831 + ... + 128491.

Almost surely, 2^7337806921 is an apocalyptic number.

7337806921 is the 85661-st square number.

7337806921 is the 42831-st centered octagonal number.

It is an amenable number.

7337806921 is a deficient number, since it is larger than the sum of its proper divisors (85662).

7337806921 is an frugal number, since it uses more digits than its factorization.

7337806921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171322 (or 85661 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 46.

The cubic root of 7337806921 is about 1943.2205444345.

The spelling of 7337806921 in words is "seven billion, three hundred thirty-seven million, eight hundred six thousand, nine hundred twenty-one".