7216211720 has 16 divisors (see below), whose sum is σ = 16236476460. Its totient is φ = 2886484672.

The previous prime is 7216211719. The next prime is 7216211729. The reversal of 7216211720 is 271126127.

It can be written as a sum of positive squares in 2 ways, for example, as 7213784356 + 2427364 = 84934^2 + 1558^2 .

It is not an unprimeable number, because it can be changed into a prime (7216211729) 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, 90202607 + ... + 90202686.

Almost surely, 2^7216211720 is an apocalyptic number.

It is an amenable number.

7216211720 is an abundant number, since it is smaller than the sum of its proper divisors (9020264740).

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

7216211720 is a wasteful number, since it uses less digits than its factorization.

7216211720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180405304 (or 180405300 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 7216211720 is about 84948.2885054196. The cubic root of 7216211720 is about 1932.4269646338.

Adding to 7216211720 its reverse (271126127), we get a palindrome (7487337847).

The spelling of 7216211720 in words is "seven billion, two hundred sixteen million, two hundred eleven thousand, seven hundred twenty".