7221113220 has 96 divisors (see below), whose sum is σ = 20553958656. Its totient is φ = 1893875200.

The previous prime is 7221113147. The next prime is 7221113227. The reversal of 7221113220 is 223111227.

It is a super-2 number, since 2×7221113220² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7221113227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1962022 + ... + 1965698.

It is an arithmetic number, because the mean of its divisors is an integer number (214103736).

Almost surely, 2^7221113220 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 7221113220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10276979328).

7221113220 is an abundant number, since it is smaller than the sum of its proper divisors (13332845436).

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

7221113220 is a wasteful number, since it uses less digits than its factorization.

7221113220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4221 (or 4219 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 7221113220 is about 84977.1335124926. The cubic root of 7221113220 is about 1932.8643893021.

Adding to 7221113220 its reverse (223111227), we get a palindrome (7444224447).

The spelling of 7221113220 in words is "seven billion, two hundred twenty-one million, one hundred thirteen thousand, two hundred twenty".