22191912 has 48 divisors (see below), whose sum is σ = 60452340. Its totient is φ = 7354368.

The previous prime is 22191901. The next prime is 22191937. The reversal of 22191912 is 21919122.

It can be written as a sum of positive squares in 2 ways, for example, as 20304036 + 1887876 = 4506^2 + 1374^2 .

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13098 + ... + 14694.

Almost surely, 2^22191912 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 22191912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30226170).

22191912 is an abundant number, since it is smaller than the sum of its proper divisors (38260428).

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

22191912 is a wasteful number, since it uses less digits than its factorization.

22191912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1802 (or 1795 counting only the distinct ones).

The product of its digits is 648, while the sum is 27.

The square root of 22191912 is about 4710.8292263677. The cubic root of 22191912 is about 281.0163404504.

The spelling of 22191912 in words is "twenty-two million, one hundred ninety-one thousand, nine hundred twelve".