22102111001221 has 4 divisors (see below), whose sum is σ = 22140416220172. Its totient is φ = 22063805782272.

The previous prime is 22102111001213. The next prime is 22102111001249. The reversal of 22102111001221 is 12210011120122.

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 15983092468996 + 6119018532225 = 3997886^2 + 2473665^2 .

It is a cyclic number.

It is not a de Polignac number, because 22102111001221 - 2³ = 22102111001213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22102111001195 and 22102111001204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22102111001261) 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, 19152608610 + ... + 19152609763.

It is an arithmetic number, because the mean of its divisors is an integer number (5535104055043).

Almost surely, 2^{22102111001221} is an apocalyptic number.

It is an amenable number.

22102111001221 is a deficient number, since it is larger than the sum of its proper divisors (38305218951).

22102111001221 is an equidigital number, since it uses as much as digits as its factorization.

22102111001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38305218950.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 22102111001221 its reverse (12210011120122), we get a palindrome (34312122121343).

The spelling of 22102111001221 in words is "twenty-two trillion, one hundred two billion, one hundred eleven million, one thousand, two hundred twenty-one".