22216211720 has 16 divisors (see below), whose sum is σ = 49986476460. Its totient is φ = 8886484672.

The previous prime is 22216211713. The next prime is 22216211723. The reversal of 22216211720 is 2711261222.

It can be written as a sum of positive squares in 2 ways, for example, as 22008909316 + 207302404 = 148354^2 + 14398^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 22216211720.

It is not an unprimeable number, because it can be changed into a prime (22216211723) 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, 277702607 + ... + 277702686.

Almost surely, 2^22216211720 is an apocalyptic number.

22216211720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22216211720 is an abundant number, since it is smaller than the sum of its proper divisors (27770264740).

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

22216211720 is a wasteful number, since it uses less digits than its factorization.

22216211720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555405304 (or 555405300 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

Adding to 22216211720 its reverse (2711261222), we get a palindrome (24927472942).

The spelling of 22216211720 in words is "twenty-two billion, two hundred sixteen million, two hundred eleven thousand, seven hundred twenty".