22211220221 has 4 divisors (see below), whose sum is σ = 23176925472. Its totient is φ = 21245514972.

The previous prime is 22211220211. The next prime is 22211220247. The reversal of 22211220221 is 12202211222.

It is a happy number.

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 22211220221 - 2³⁴ = 5031351037 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22211220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22211220211) 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, 482852591 + ... + 482852636.

It is an arithmetic number, because the mean of its divisors is an integer number (5794231368).

Almost surely, 2^22211220221 is an apocalyptic number.

It is an amenable number.

22211220221 is a deficient number, since it is larger than the sum of its proper divisors (965705251).

22211220221 is an equidigital number, since it uses as much as digits as its factorization.

22211220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 965705250.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 22211220221 its reverse (12202211222), we get a palindrome (34413431443).

The spelling of 22211220221 in words is "twenty-two billion, two hundred eleven million, two hundred twenty thousand, two hundred twenty-one".