21834330 has 64 divisors (see below), whose sum is σ = 60334848. Its totient is φ = 4953600.

The previous prime is 21834277. The next prime is 21834331. The reversal of 21834330 is 3343812.

It is a self number, because there is not a number n which added to its sum of digits gives 21834330.

It is not an unprimeable number, because it can be changed into a prime (21834331) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36030 + ... + 36630.

It is an arithmetic number, because the mean of its divisors is an integer number (942732).

Almost surely, 2^21834330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21834330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30167424).

21834330 is an abundant number, since it is smaller than the sum of its proper divisors (38500518).

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

21834330 is a wasteful number, since it uses less digits than its factorization.

21834330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 791.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 21834330 is about 4672.7219048430. The cubic root of 21834330 is about 279.4988057890.

The spelling of 21834330 in words is "twenty-one million, eight hundred thirty-four thousand, three hundred thirty".