7221140 has 48 divisors (see below), whose sum is σ = 16504320. Its totient is φ = 2643840.

The previous prime is 7221131. The next prime is 7221143. The reversal of 7221140 is 411227.

7221140 = 138² + 139² + ... + 289².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7221143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11474 + ... + 12086.

It is an arithmetic number, because the mean of its divisors is an integer number (343840).

Almost surely, 2^7221140 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7221140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8252160).

7221140 is an abundant number, since it is smaller than the sum of its proper divisors (9283180).

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

7221140 is a wasteful number, since it uses less digits than its factorization.

7221140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672 (or 670 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 7221140 is about 2687.2178921703. The cubic root of 7221140 is about 193.2866778686.

Adding to 7221140 its reverse (411227), we get a palindrome (7632367).

It can be divided in two parts, 72 and 21140, that added together give a palindrome (21212).

The spelling of 7221140 in words is "seven million, two hundred twenty-one thousand, one hundred forty".