21334238 has 8 divisors (see below), whose sum is σ = 32115288. Its totient is φ = 10629144.

The previous prime is 21334219. The next prime is 21334241. The reversal of 21334238 is 83243312.

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

It is a super-2 number, since 2×21334238² = 910299422081288, which contains 22 as substring.

It is a Curzon number.

It is a plaindrome in base 16.

It is a congruent number.

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, 18281 + ... + 19412.

It is an arithmetic number, because the mean of its divisors is an integer number (4014411).

Almost surely, 2^21334238 is an apocalyptic number.

21334238 is a deficient number, since it is larger than the sum of its proper divisors (10781050).

21334238 is a wasteful number, since it uses less digits than its factorization.

21334238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37978.

The product of its digits is 3456, while the sum is 26.

The square root of 21334238 is about 4618.9000855182. The cubic root of 21334238 is about 277.3484300650.

The spelling of 21334238 in words is "twenty-one million, three hundred thirty-four thousand, two hundred thirty-eight".