21838884 has 24 divisors (see below), whose sum is σ = 51455040. Its totient is φ = 7208544.

The previous prime is 21838867. The next prime is 21838889. The reversal of 21838884 is 48883812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21838889) 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 7 ways as a sum of consecutive naturals, for example, 7599 + ... + 10070.

It is an arithmetic number, because the mean of its divisors is an integer number (2143960).

Almost surely, 2^21838884 is an apocalyptic number.

It is an amenable number.

21838884 is an abundant number, since it is smaller than the sum of its proper divisors (29616156).

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

21838884 is a wasteful number, since it uses less digits than its factorization.

21838884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17779 (or 17777 counting only the distinct ones).

The product of its digits is 98304, while the sum is 42.

The square root of 21838884 is about 4673.2091757164. The cubic root of 21838884 is about 279.5182361856.

It can be divided in two parts, 21838 and 884, that added together give a palindrome (22722).

The spelling of 21838884 in words is "twenty-one million, eight hundred thirty-eight thousand, eight hundred eighty-four".