22121111221 has 48 divisors (see below), whose sum is σ = 25642153152. Its totient is φ = 19050071040.

The previous prime is 22121111197. The next prime is 22121111239. The reversal of 22121111221 is 12211112122.

It is not a de Polignac number, because 22121111221 - 2¹⁹ = 22120586933 is a prime.

It is a super-2 number, since 2×22121111221² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 22121111195 and 22121111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121111261) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 26748210 + ... + 26749036.

It is an arithmetic number, because the mean of its divisors is an integer number (534211524).

Almost surely, 2^22121111221 is an apocalyptic number.

It is an amenable number.

22121111221 is a deficient number, since it is larger than the sum of its proper divisors (3521041931).

22121111221 is a wasteful number, since it uses less digits than its factorization.

22121111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042 (or 1031 counting only the distinct ones).

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

Adding to 22121111221 its reverse (12211112122), we get a palindrome (34332223343).

Subtracting from 22121111221 its reverse (12211112122), we obtain a palindrome (9909999099).

The spelling of 22121111221 in words is "twenty-two billion, one hundred twenty-one million, one hundred eleven thousand, two hundred twenty-one".