7429221 has 24 divisors (see below), whose sum is σ = 11568960. Its totient is φ = 4576896.

The previous prime is 7429211. The next prime is 7429223. The reversal of 7429221 is 1229247.

It is not a de Polignac number, because 7429221 - 2⁶ = 7429157 is a prime.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7429223) 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, 8616 + ... + 9438.

It is an arithmetic number, because the mean of its divisors is an integer number (482040).

Almost surely, 2^7429221 is an apocalyptic number.

It is an amenable number.

7429221 is a deficient number, since it is larger than the sum of its proper divisors (4139739).

7429221 is a wasteful number, since it uses less digits than its factorization.

7429221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905 (or 902 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 7429221 is about 2725.6597366509. The cubic root of 7429221 is about 195.1256783512.

The spelling of 7429221 in words is "seven million, four hundred twenty-nine thousand, two hundred twenty-one".