22011112021 has 4 divisors (see below), whose sum is σ = 22011416172. Its totient is φ = 22010807872.

The previous prime is 22011112007. The next prime is 22011112069. The reversal of 22011112021 is 12021111022.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12021111022 = 2 ⋅6010555511.

It can be written as a sum of positive squares in 2 ways, for example, as 15948153796 + 6062958225 = 126286^2 + 77865^2 .

It is a cyclic number.

It is not a de Polignac number, because 22011112021 - 2¹⁹ = 22010587733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22011111992 and 22011112010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22011112121) 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, 25935 + ... + 211411.

It is an arithmetic number, because the mean of its divisors is an integer number (5502854043).

Almost surely, 2^22011112021 is an apocalyptic number.

It is an amenable number.

22011112021 is a deficient number, since it is larger than the sum of its proper divisors (304151).

22011112021 is a wasteful number, since it uses less digits than its factorization.

22011112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304150.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 22011112021 its reverse (12021111022), we get a palindrome (34032223043).

Subtracting from 22011112021 its reverse (12021111022), we obtain a palindrome (9990000999).

The spelling of 22011112021 in words is "twenty-two billion, eleven million, one hundred twelve thousand, twenty-one".