21833256 has 64 divisors (see below), whose sum is σ = 58550400. Its totient is φ = 6766848.

The previous prime is 21833237. The next prime is 21833257. The reversal of 21833256 is 65233812.

It is not an unprimeable number, because it can be changed into a prime (21833257) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19890 + ... + 20958.

It is an arithmetic number, because the mean of its divisors is an integer number (914850).

Almost surely, 2^21833256 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 21833256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29275200).

21833256 is an abundant number, since it is smaller than the sum of its proper divisors (36717144).

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

21833256 is a wasteful number, since it uses less digits than its factorization.

21833256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1138 (or 1134 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

The square root of 21833256 is about 4672.6069811188. The cubic root of 21833256 is about 279.4942229960.

The spelling of 21833256 in words is "twenty-one million, eight hundred thirty-three thousand, two hundred fifty-six".