21888334 has 8 divisors (see below), whose sum is σ = 35358120. Its totient is φ = 10102296.

The previous prime is 21888331. The next prime is 21888379. The reversal of 21888334 is 43388812.

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

It is a junction number, because it is equal to n+sod(n) for n = 21888293 and 21888302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21888331) 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, 420904 + ... + 420955.

It is an arithmetic number, because the mean of its divisors is an integer number (4419765).

Almost surely, 2^21888334 is an apocalyptic number.

21888334 is a deficient number, since it is larger than the sum of its proper divisors (13469786).

21888334 is a wasteful number, since it uses less digits than its factorization.

21888334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841874.

The product of its digits is 36864, while the sum is 37.

The square root of 21888334 is about 4678.4969808690. The cubic root of 21888334 is about 279.7290491148.

It can be divided in two parts, 21888 and 334, that added together give a palindrome (22222).

The spelling of 21888334 in words is "twenty-one million, eight hundred eighty-eight thousand, three hundred thirty-four".