7200921 has 24 divisors (see below), whose sum is σ = 11887680. Its totient is φ = 3796416.

The previous prime is 7200913. The next prime is 7200923. The reversal of 7200921 is 1290027.

It is a happy number.

It is not a de Polignac number, because 7200921 - 2³ = 7200913 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (7200923) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2535 + ... + 4563.

It is an arithmetic number, because the mean of its divisors is an integer number (495320).

Almost surely, 2^7200921 is an apocalyptic number.

It is an amenable number.

7200921 is a deficient number, since it is larger than the sum of its proper divisors (4686759).

7200921 is a wasteful number, since it uses less digits than its factorization.

7200921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2065 (or 2052 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 7200921 is about 2683.4531857292. The cubic root of 7200921 is about 193.1061100490.

Adding to 7200921 its reverse (1290027), we get a palindrome (8490948).

The spelling of 7200921 in words is "seven million, two hundred thousand, nine hundred twenty-one".