2221600891780 has 12 divisors (see below), whose sum is σ = 4665361872780. Its totient is φ = 888640356704.

The previous prime is 2221600891703. The next prime is 2221600891781. The reversal of 2221600891780 is 871980061222.

It can be written as a sum of positive squares in 2 ways, for example, as 617381061696 + 1604219830084 = 785736^2 + 1266578^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2221600891780.

It is not an unprimeable number, because it can be changed into a prime (2221600891781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55540022275 + ... + 55540022314.

It is an arithmetic number, because the mean of its divisors is an integer number (388780156065).

Almost surely, 2^{2221600891780} is an apocalyptic number.

2221600891780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2221600891780 is an abundant number, since it is smaller than the sum of its proper divisors (2443760981000).

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

2221600891780 is a wasteful number, since it uses less digits than its factorization.

2221600891780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111080044598 (or 111080044596 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 46.

The spelling of 2221600891780 in words is "two trillion, two hundred twenty-one billion, six hundred million, eight hundred ninety-one thousand, seven hundred eighty".