22101100221221 has 4 divisors (see below), whose sum is σ = 25258400252832. Its totient is φ = 18943800189612.

The previous prime is 22101100221209. The next prime is 22101100221253. The reversal of 22101100221221 is 12212200110122.

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 22101100221221 - 2⁶ = 22101100221157 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 22101100221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22101100221271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1578650015795 + ... + 1578650015808.

It is an arithmetic number, because the mean of its divisors is an integer number (6314600063208).

Almost surely, 2^{22101100221221} is an apocalyptic number.

It is an amenable number.

22101100221221 is a deficient number, since it is larger than the sum of its proper divisors (3157300031611).

22101100221221 is an equidigital number, since it uses as much as digits as its factorization.

22101100221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3157300031610.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 22101100221221 its reverse (12212200110122), we get a palindrome (34313300331343).

The spelling of 22101100221221 in words is "twenty-two trillion, one hundred one billion, one hundred million, two hundred twenty-one thousand, two hundred twenty-one".