7431221 has 8 divisors (see below), whose sum is σ = 8785920. Its totient is φ = 6149808.

The previous prime is 7431211. The next prime is 7431247. The reversal of 7431221 is 1221347.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7431221 - 2⁶ = 7431157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 7431193 and 7431202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7431211) 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 7 ways as a sum of consecutive naturals, for example, 18101 + ... + 18506.

It is an arithmetic number, because the mean of its divisors is an integer number (1098240).

Almost surely, 2^7431221 is an apocalyptic number.

It is an amenable number.

7431221 is a deficient number, since it is larger than the sum of its proper divisors (1354699).

7431221 is a wasteful number, since it uses less digits than its factorization.

7431221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36643.

The product of its digits is 336, while the sum is 20.

The square root of 7431221 is about 2726.0265956149. The cubic root of 7431221 is about 195.1431865279.

Adding to 7431221 its reverse (1221347), we get a palindrome (8652568).

The spelling of 7431221 in words is "seven million, four hundred thirty-one thousand, two hundred twenty-one".