7225421 has 8 divisors (see below), whose sum is σ = 8293824. Its totient is φ = 6166080.

The previous prime is 7225417. The next prime is 7225429. The reversal of 7225421 is 1245227.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 7225421 - 2² = 7225417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7225429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 455 + ... + 3828.

It is an arithmetic number, because the mean of its divisors is an integer number (1036728).

Almost surely, 2^7225421 is an apocalyptic number.

It is an amenable number.

7225421 is a deficient number, since it is larger than the sum of its proper divisors (1068403).

7225421 is a wasteful number, since it uses less digits than its factorization.

7225421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4531.

The product of its digits is 1120, while the sum is 23.

The square root of 7225421 is about 2688.0143228785. The cubic root of 7225421 is about 193.3248665205.

The spelling of 7225421 in words is "seven million, two hundred twenty-five thousand, four hundred twenty-one".