22249788794221 has 4 divisors (see below), whose sum is σ = 22252122779292. Its totient is φ = 22247454809152.

The previous prime is 22249788794087. The next prime is 22249788794227. The reversal of 22249788794221 is 12249788794222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11502177288196 + 10747611506025 = 3391486^2 + 3278355^2 .

It is a cyclic number.

It is not a de Polignac number, because 22249788794221 - 2¹⁷ = 22249788663149 is a prime.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22249788794227) 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, 1166978236 + ... + 1166997301.

It is an arithmetic number, because the mean of its divisors is an integer number (5563030694823).

Almost surely, 2^{22249788794221} is an apocalyptic number.

It is an amenable number.

22249788794221 is a deficient number, since it is larger than the sum of its proper divisors (2333985071).

22249788794221 is an equidigital number, since it uses as much as digits as its factorization.

22249788794221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2333985070.

The product of its digits is 130056192, while the sum is 67.

Subtracting from 22249788794221 its reverse (12249788794222), we obtain a palindrome (9999999999999).

The spelling of 22249788794221 in words is "twenty-two trillion, two hundred forty-nine billion, seven hundred eighty-eight million, seven hundred ninety-four thousand, two hundred twenty-one".