22011912 has 144 divisors (see below), whose sum is σ = 67944240. Its totient is φ = 6671808.

The previous prime is 22011893. The next prime is 22011931. The reversal of 22011912 is 21911022.

It is an interprime number because it is at equal distance from previous prime (22011893) and next prime (22011931).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 328503 + ... + 328569.

It is an arithmetic number, because the mean of its divisors is an integer number (471835).

Almost surely, 2^22011912 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22011912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33972120).

22011912 is an abundant number, since it is smaller than the sum of its proper divisors (45932328).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22011912 is a wasteful number, since it uses less digits than its factorization.

22011912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114 (or 85 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 22011912 is about 4691.6854114486. The cubic root of 22011912 is about 280.2544965051.

Adding to 22011912 its reverse (21911022), we get a palindrome (43922934).

The spelling of 22011912 in words is "twenty-two million, eleven thousand, nine hundred twelve".