7432221 has 4 divisors (see below), whose sum is σ = 9909632. Its totient is φ = 4954812.

The previous prime is 7432181. The next prime is 7432231. The reversal of 7432221 is 1222347.

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 7432221 - 2⁷ = 7432093 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7432231) 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, 1238701 + ... + 1238706.

It is an arithmetic number, because the mean of its divisors is an integer number (2477408).

Almost surely, 2^7432221 is an apocalyptic number.

It is an amenable number.

7432221 is a deficient number, since it is larger than the sum of its proper divisors (2477411).

7432221 is a wasteful number, since it uses less digits than its factorization.

7432221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2477410.

The product of its digits is 672, while the sum is 21.

The square root of 7432221 is about 2726.2100065842. The cubic root of 7432221 is about 195.1519394383.

Adding to 7432221 its reverse (1222347), we get a palindrome (8654568).

The spelling of 7432221 in words is "seven million, four hundred thirty-two thousand, two hundred twenty-one".