21596922 has 64 divisors (see below), whose sum is σ = 50181120. Its totient is φ = 6879600.

The previous prime is 21596921. The next prime is 21596951. The reversal of 21596922 is 22969512.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21596921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 164797 + ... + 164927.

It is an arithmetic number, because the mean of its divisors is an integer number (784080).

Almost surely, 2^21596922 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21596922, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25090560).

21596922 is an abundant number, since it is smaller than the sum of its proper divisors (28584198).

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

21596922 is a wasteful number, since it uses less digits than its factorization.

21596922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256 (or 250 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 21596922 is about 4647.2488635751. The cubic root of 21596922 is about 278.4821008602.

The spelling of 21596922 in words is "twenty-one million, five hundred ninety-six thousand, nine hundred twenty-two".