22101220221 has 4 divisors (see below), whose sum is σ = 29468293632. Its totient is φ = 14734146812.

The previous prime is 22101220181. The next prime is 22101220231. The reversal of 22101220221 is 12202210122.

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 22101220221 - 2⁶ = 22101220157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22101220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22101220231) 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, 3683536701 + ... + 3683536706.

It is an arithmetic number, because the mean of its divisors is an integer number (7367073408).

Almost surely, 2^22101220221 is an apocalyptic number.

It is an amenable number.

22101220221 is a deficient number, since it is larger than the sum of its proper divisors (7367073411).

22101220221 is an equidigital number, since it uses as much as digits as its factorization.

22101220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7367073410.

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

Adding to 22101220221 its reverse (12202210122), we get a palindrome (34303430343).

The spelling of 22101220221 in words is "twenty-two billion, one hundred one million, two hundred twenty thousand, two hundred twenty-one".