21884738 has 8 divisors (see below), whose sum is σ = 33242880. Its totient is φ = 10803780.

The previous prime is 21884699. The next prime is 21884741. The reversal of 21884738 is 83748812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21884695 and 21884704.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69098 + ... + 69413.

It is an arithmetic number, because the mean of its divisors is an integer number (4155360).

Almost surely, 2^21884738 is an apocalyptic number.

21884738 is a deficient number, since it is larger than the sum of its proper divisors (11358142).

21884738 is a wasteful number, since it uses less digits than its factorization.

21884738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138592.

The product of its digits is 86016, while the sum is 41.

The square root of 21884738 is about 4678.1126536243. The cubic root of 21884738 is about 279.7137295272.

It can be divided in two parts, 21884 and 738, that added together give a palindrome (22622).

The spelling of 21884738 in words is "twenty-one million, eight hundred eighty-four thousand, seven hundred thirty-eight".