21922012 has 18 divisors (see below), whose sum is σ = 44627352. Its totient is φ = 9395064.

The previous prime is 21922009. The next prime is 21922037. The reversal of 21922012 is 21022912.

It is a super-2 number, since 2×21922012² = 961149220256288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55728 + ... + 56119.

Almost surely, 2^21922012 is an apocalyptic number.

It is an amenable number.

21922012 is an abundant number, since it is smaller than the sum of its proper divisors (22705340).

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

21922012 is a wasteful number, since it uses less digits than its factorization.

21922012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111865 (or 111856 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 21922012 is about 4682.0948303083. The cubic root of 21922012 is about 279.8724418979.

Adding to 21922012 its reverse (21022912), we get a palindrome (42944924).

The spelling of 21922012 in words is "twenty-one million, nine hundred twenty-two thousand, twelve".