2193116721 has 4 divisors (see below), whose sum is σ = 2924155632. Its totient is φ = 1462077812.

The previous prime is 2193116711. The next prime is 2193116749. The reversal of 2193116721 is 1276113912.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2193116721 - 2¹⁴ = 2193100337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2193116701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 365519451 + ... + 365519456.

It is an arithmetic number, because the mean of its divisors is an integer number (731038908).

Almost surely, 2^2193116721 is an apocalyptic number.

It is an amenable number.

2193116721 is a deficient number, since it is larger than the sum of its proper divisors (731038911).

2193116721 is an equidigital number, since it uses as much as digits as its factorization.

2193116721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731038910.

The product of its digits is 4536, while the sum is 33.

The square root of 2193116721 is about 46830.7241135560. The cubic root of 2193116721 is about 1299.2336155432.

The spelling of 2193116721 in words is "two billion, one hundred ninety-three million, one hundred sixteen thousand, seven hundred twenty-one".