21842336 has 24 divisors (see below), whose sum is σ = 44486820. Its totient is φ = 10544128.

The previous prime is 21842333. The next prime is 21842347. The reversal of 21842336 is 63324812.

It can be written as a sum of positive squares in 2 ways, for example, as 21715600 + 126736 = 4660^2 + 356^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a junction number, because it is equal to n+sod(n) for n = 21842299 and 21842308.

It is not an unprimeable number, because it can be changed into a prime (21842333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10841 + ... + 12696.

Almost surely, 2^21842336 is an apocalyptic number.

It is an amenable number.

21842336 is an abundant number, since it is smaller than the sum of its proper divisors (22644484).

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

21842336 is a wasteful number, since it uses less digits than its factorization.

21842336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23576 (or 23568 counting only the distinct ones).

The product of its digits is 6912, while the sum is 29.

The square root of 21842336 is about 4673.5785004641. The cubic root of 21842336 is about 279.5329629167.

The spelling of 21842336 in words is "twenty-one million, eight hundred forty-two thousand, three hundred thirty-six".