22101111221 has 4 divisors (see below), whose sum is σ = 25258412832. Its totient is φ = 18943809612.

The previous prime is 22101111211. The next prime is 22101111251. The reversal of 22101111221 is 12211110122.

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 not a de Polignac number, because 22101111221 - 2²² = 22096916917 is a prime.

It is a super-2 number, since 2×22101111221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22101111196 and 22101111205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22101111211) 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, 1578650795 + ... + 1578650808.

It is an arithmetic number, because the mean of its divisors is an integer number (6314603208).

Almost surely, 2^22101111221 is an apocalyptic number.

It is an amenable number.

22101111221 is a deficient number, since it is larger than the sum of its proper divisors (3157301611).

22101111221 is an equidigital number, since it uses as much as digits as its factorization.

22101111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3157301610.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 22101111221 its reverse (12211110122), we get a palindrome (34312221343).

It can be divided in two parts, 221011 and 11221, that added together give a palindrome (232232).

The spelling of 22101111221 in words is "twenty-two billion, one hundred one million, one hundred eleven thousand, two hundred twenty-one".