7221215232 has 544 divisors, whose sum is σ = 27178882560. Its totient is φ = 1840250880.

The previous prime is 7221215231. The next prime is 7221215257. The reversal of 7221215232 is 2325121227.

It is a Harshad number since it is a multiple of its sum of digits (27).

Its product of digits (3360) is a multiple of the sum of its prime factors (112).

It is a junction number, because it is equal to n+sod(n) for n = 7221215196 and 7221215205.

It is not an unprimeable number, because it can be changed into a prime (7221215231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 136249318 + ... + 136249370.

Almost surely, 2^7221215232 is an apocalyptic number.

7221215232 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7221215232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13589441280).

7221215232 is an abundant number, since it is smaller than the sum of its proper divisors (19957667328).

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

7221215232 is an equidigital number, since it uses as much as digits as its factorization.

7221215232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112 (or 76 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 7221215232 is about 84977.7337424340. The cubic root of 7221215232 is about 1932.8734910582.

Adding to 7221215232 its reverse (2325121227), we get a palindrome (9546336459).

The spelling of 7221215232 in words is "seven billion, two hundred twenty-one million, two hundred fifteen thousand, two hundred thirty-two".