21324834 has 48 divisors (see below), whose sum is σ = 49297248. Its totient is φ = 6638976.

The previous prime is 21324803. The next prime is 21324847. The reversal of 21324834 is 43842312.

It is a junction number, because it is equal to n+sod(n) for n = 21324798 and 21324807.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69309 + ... + 69615.

It is an arithmetic number, because the mean of its divisors is an integer number (1027026).

Almost surely, 2^21324834 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21324834, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24648624).

21324834 is an abundant number, since it is smaller than the sum of its proper divisors (27972414).

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

21324834 is a wasteful number, since it uses less digits than its factorization.

21324834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559 (or 556 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 21324834 is about 4617.8819820346. The cubic root of 21324834 is about 277.3076729191.

The spelling of 21324834 in words is "twenty-one million, three hundred twenty-four thousand, eight hundred thirty-four".