22011220221 has 4 divisors (see below), whose sum is σ = 29348293632. Its totient is φ = 14674146812.

The previous prime is 22011220219. The next prime is 22011220241. The reversal of 22011220221 is 12202211022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22011220221 - 2¹ = 22011220219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22011220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22011220241) 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, 3668536701 + ... + 3668536706.

It is an arithmetic number, because the mean of its divisors is an integer number (7337073408).

Almost surely, 2^22011220221 is an apocalyptic number.

It is an amenable number.

22011220221 is a deficient number, since it is larger than the sum of its proper divisors (7337073411).

22011220221 is an equidigital number, since it uses as much as digits as its factorization.

22011220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7337073410.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 22011220221 its reverse (12202211022), we get a palindrome (34213431243).

The spelling of 22011220221 in words is "twenty-two billion, eleven million, two hundred twenty thousand, two hundred twenty-one".