7381221 has 4 divisors (see below), whose sum is σ = 9841632. Its totient is φ = 4920812.

The previous prime is 7381217. The next prime is 7381259. The reversal of 7381221 is 1221837.

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 a cyclic number.

It is not a de Polignac number, because 7381221 - 2² = 7381217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7381191 and 7381200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7381211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1230201 + ... + 1230206.

It is an arithmetic number, because the mean of its divisors is an integer number (2460408).

Almost surely, 2^7381221 is an apocalyptic number.

It is an amenable number.

7381221 is a deficient number, since it is larger than the sum of its proper divisors (2460411).

7381221 is a wasteful number, since it uses less digits than its factorization.

7381221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2460410.

The product of its digits is 672, while the sum is 24.

The square root of 7381221 is about 2716.8402603024. The cubic root of 7381221 is about 194.7045361028.

The spelling of 7381221 in words is "seven million, three hundred eighty-one thousand, two hundred twenty-one".