7221330 has 96 divisors (see below), whose sum is σ = 20442240. Its totient is φ = 1762560.

The previous prime is 7221307. The next prime is 7221353. The reversal of 7221330 is 331227.

It is an interprime number because it is at equal distance from previous prime (7221307) and next prime (7221353).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 70059 + ... + 70161.

It is an arithmetic number, because the mean of its divisors is an integer number (212940).

Almost surely, 2^7221330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7221330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10221120).

7221330 is an abundant number, since it is smaller than the sum of its proper divisors (13220910).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7221330 is a wasteful number, since it uses less digits than its factorization.

7221330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176 (or 173 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 18.

The square root of 7221330 is about 2687.2532444859. The cubic root of 7221330 is about 193.2883730833.

Adding to 7221330 its reverse (331227), we get a palindrome (7552557).

The spelling of 7221330 in words is "seven million, two hundred twenty-one thousand, three hundred thirty".