2210721 has 8 divisors (see below), whose sum is σ = 2955360. Its totient is φ = 1469952.

The previous prime is 2210653. The next prime is 2210723. The reversal of 2210721 is 1270122.

2210721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 2210721 - 2⁹ = 2210209 is a prime.

2210721 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2210721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2210723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 865 + ... + 2273.

It is an arithmetic number, because the mean of its divisors is an integer number (369420).

2^2210721 is an apocalyptic number.

It is an amenable number.

2210721 is a deficient number, since it is larger than the sum of its proper divisors (744639).

2210721 is a wasteful number, since it uses less digits than its factorization.

2210721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1935.

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 2210721 is about 1486.8493534989. The cubic root of 2210721 is about 130.2700697163.

Adding to 2210721 its reverse (1270122), we get a palindrome (3480843).

The spelling of 2210721 in words is "two million, two hundred ten thousand, seven hundred twenty-one".