22129856 has 56 divisors (see below), whose sum is σ = 51303936. Its totient is φ = 9273600.

The previous prime is 22129853. The next prime is 22129901. The reversal of 22129856 is 65892122.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22129853) 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, 20531 + ... + 21581.

Almost surely, 2^22129856 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 22129856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25651968).

22129856 is an abundant number, since it is smaller than the sum of its proper divisors (29174080).

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

22129856 is a wasteful number, since it uses less digits than its factorization.

22129856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1117 (or 1107 counting only the distinct ones).

The product of its digits is 17280, while the sum is 35.

The square root of 22129856 is about 4704.2380892127. The cubic root of 22129856 is about 280.7541573905.

The spelling of 22129856 in words is "twenty-two million, one hundred twenty-nine thousand, eight hundred fifty-six".