7205621 has 4 divisors (see below), whose sum is σ = 7257600. Its totient is φ = 7153644.

The previous prime is 7205587. The next prime is 7205629. The reversal of 7205621 is 1265027.

7205621 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 7205621 - 2⁶ = 7205557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7205629) 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, 25781 + ... + 26058.

It is an arithmetic number, because the mean of its divisors is an integer number (1814400).

Almost surely, 2^7205621 is an apocalyptic number.

It is an amenable number.

7205621 is a deficient number, since it is larger than the sum of its proper divisors (51979).

7205621 is a wasteful number, since it uses less digits than its factorization.

7205621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51978.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 7205621 is about 2684.3287801609. The cubic root of 7205621 is about 193.1481139967.

The spelling of 7205621 in words is "seven million, two hundred five thousand, six hundred twenty-one".