2193694721 has 8 divisors (see below), whose sum is σ = 2224285440. Its totient is φ = 2163282912.

The previous prime is 2193694703. The next prime is 2193694747. The reversal of 2193694721 is 1274963912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2193694721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2193694781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19940 + ... + 69173.

It is an arithmetic number, because the mean of its divisors is an integer number (278035680).

Almost surely, 2^2193694721 is an apocalyptic number.

It is an amenable number.

2193694721 is a deficient number, since it is larger than the sum of its proper divisors (30590719).

2193694721 is a wasteful number, since it uses less digits than its factorization.

2193694721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89455.

The product of its digits is 163296, while the sum is 44.

The square root of 2193694721 is about 46836.8948693228. The cubic root of 2193694721 is about 1299.3477439980.

The spelling of 2193694721 in words is "two billion, one hundred ninety-three million, six hundred ninety-four thousand, seven hundred twenty-one".