7221072 has 20 divisors (see below), whose sum is σ = 18654560. Its totient is φ = 2407008.

The previous prime is 7221041. The next prime is 7221077. The reversal of 7221072 is 2701227.

7221072 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7221077) 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, 75172 + ... + 75267.

It is an arithmetic number, because the mean of its divisors is an integer number (932728).

Almost surely, 2^7221072 is an apocalyptic number.

It is an amenable number.

7221072 is an abundant number, since it is smaller than the sum of its proper divisors (11433488).

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

7221072 is a wasteful number, since it uses less digits than its factorization.

7221072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150450 (or 150444 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 21.

The square root of 7221072 is about 2687.2052396496. The cubic root of 7221072 is about 193.2860711530.

Adding to 7221072 its reverse (2701227), we get a palindrome (9922299).

The spelling of 7221072 in words is "seven million, two hundred twenty-one thousand, seventy-two".