21922912 has 48 divisors (see below), whose sum is σ = 47903184. Its totient is φ = 9792000.

The previous prime is 21922897. The next prime is 21922913.

21922912 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×21922912² = 961228141119488, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21922913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20962 + ... + 21982.

It is an arithmetic number, because the mean of its divisors is an integer number (997983).

Almost surely, 2^21922912 is an apocalyptic number.

21922912 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21922912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23951592).

21922912 is an abundant number, since it is smaller than the sum of its proper divisors (25980272).

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

21922912 is a wasteful number, since it uses less digits than its factorization.

21922912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1103 (or 1095 counting only the distinct ones).

The product of its digits is 1296, while the sum is 28.

The square root of 21922912 is about 4682.1909401476. The cubic root of 21922912 is about 279.8762718649.

The spelling of 21922912 in words is "twenty-one million, nine hundred twenty-two thousand, nine hundred twelve".