2002721 has 4 divisors (see below), whose sum is σ = 2288832. Its totient is φ = 1716612.

The previous prime is 2002681. The next prime is 2002723. The reversal of 2002721 is 1272002.

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 2002721 - 2¹⁰ = 2001697 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2002696 and 2002705.

It is not an unprimeable number, because it can be changed into a prime (2002723) 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 3 ways as a sum of consecutive naturals, for example, 143045 + ... + 143058.

It is an arithmetic number, because the mean of its divisors is an integer number (572208).

2^2002721 is an apocalyptic number.

It is an amenable number.

2002721 is a deficient number, since it is larger than the sum of its proper divisors (286111).

2002721 is an equidigital number, since it uses as much as digits as its factorization.

2002721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286110.

The product of its (nonzero) digits is 56, while the sum is 14.

The square root of 2002721 is about 1415.1752541647. The cubic root of 2002721 is about 126.0492165168.

Adding to 2002721 its reverse (1272002), we get a palindrome (3274723).

The spelling of 2002721 in words is "two million, two thousand, seven hundred twenty-one".