21334836 has 48 divisors (see below), whose sum is σ = 52093440. Its totient is φ = 6787200.

The previous prime is 21334787. The next prime is 21334849. The reversal of 21334836 is 63843312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34845 + ... + 35451.

It is an arithmetic number, because the mean of its divisors is an integer number (1085280).

Almost surely, 2^21334836 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 21334836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26046720).

21334836 is an abundant number, since it is smaller than the sum of its proper divisors (30758604).

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

21334836 is a wasteful number, since it uses less digits than its factorization.

21334836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 744 (or 742 counting only the distinct ones).

The product of its digits is 10368, while the sum is 30.

The square root of 21334836 is about 4618.9648190910. The cubic root of 21334836 is about 277.3510214053.

The spelling of 21334836 in words is "twenty-one million, three hundred thirty-four thousand, eight hundred thirty-six".