2196721 has 8 divisors (see below), whose sum is σ = 2289600. Its totient is φ = 2105040.

The previous prime is 2196713. The next prime is 2196731. The reversal of 2196721 is 1276912.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2196721 - 2³ = 2196713 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 2196721.

It is not an unprimeable number, because it can be changed into a prime (2196731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5940 + ... + 6298.

It is an arithmetic number, because the mean of its divisors is an integer number (286200).

2^2196721 is an apocalyptic number.

It is an amenable number.

2196721 is a deficient number, since it is larger than the sum of its proper divisors (92879).

2196721 is a wasteful number, since it uses less digits than its factorization.

2196721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 599.

The product of its digits is 1512, while the sum is 28.

The square root of 2196721 is about 1482.1339345687. The cubic root of 2196721 is about 129.9944968085.

The spelling of 2196721 in words is "two million, one hundred ninety-six thousand, seven hundred twenty-one".