7368993438921 has 45 divisors (see below), whose sum is σ = 11136363722341. Its totient is φ = 4856030536896.

The previous prime is 7368993438883. The next prime is 7368993438929. The reversal of 7368993438921 is 1298343998637.

The square root of 7368993438921 is 2714589.

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

7368993438921 is a `hidden beast` number, since 7 + 3 + 6 + 89 + 93 + 438 + 9 + 21 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 569102763321 + 6799890675600 = 754389^2 + 2607660^2 .

It is not a de Polignac number, because 7368993438921 - 2⁹ = 7368993438409 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7368993438921.

It is not an unprimeable number, because it can be changed into a prime (7368993438929) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 2174384095 + ... + 2174387483.

Almost surely, 2^{7368993438921} is an apocalyptic number.

7368993438921 is the 2714589-th square number.

7368993438921 is the 1357295-th centered octagonal number.

It is an amenable number.

7368993438921 is a deficient number, since it is larger than the sum of its proper divisors (3767370283420).

7368993438921 is an frugal number, since it uses more digits than its factorization.

7368993438921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6968 (or 3481 counting only the distinct ones).

The product of its digits is 423263232, while the sum is 72.

The spelling of 7368993438921 in words is "seven trillion, three hundred sixty-eight billion, nine hundred ninety-three million, four hundred thirty-eight thousand, nine hundred twenty-one".