21842338 has 24 divisors (see below), whose sum is σ = 38487312. Its totient is φ = 9269064.

The previous prime is 21842333. The next prime is 21842347. The reversal of 21842338 is 83324812.

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

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 11 ways as a sum of consecutive naturals, for example, 9445 + ... + 11527.

It is an arithmetic number, because the mean of its divisors is an integer number (1603638).

Almost surely, 2^21842338 is an apocalyptic number.

21842338 is a deficient number, since it is larger than the sum of its proper divisors (16644974).

21842338 is a wasteful number, since it uses less digits than its factorization.

21842338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2206 (or 2199 counting only the distinct ones).

The product of its digits is 9216, while the sum is 31.

The square root of 21842338 is about 4673.5787144329. The cubic root of 21842338 is about 279.5329714486.

The spelling of 21842338 in words is "twenty-one million, eight hundred forty-two thousand, three hundred thirty-eight".