7202721 has 4 divisors (see below), whose sum is σ = 9603632. Its totient is φ = 4801812.

The previous prime is 7202717. The next prime is 7202761. The reversal of 7202721 is 1272027.

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 not a de Polignac number, because 7202721 - 2² = 7202717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7202711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1200451 + ... + 1200456.

It is an arithmetic number, because the mean of its divisors is an integer number (2400908).

Almost surely, 2^7202721 is an apocalyptic number.

It is an amenable number.

7202721 is a deficient number, since it is larger than the sum of its proper divisors (2400911).

7202721 is a wasteful number, since it uses less digits than its factorization.

7202721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2400910.

The product of its (nonzero) digits is 392, while the sum is 21.

The square root of 7202721 is about 2683.7885535191. The cubic root of 7202721 is about 193.1221988262.

Adding to 7202721 its reverse (1272027), we get a palindrome (8474748).

The spelling of 7202721 in words is "seven million, two hundred two thousand, seven hundred twenty-one".