21334239 has 16 divisors (see below), whose sum is σ = 31682400. Its totient is φ = 14188608.

The previous prime is 21334219. The next prime is 21334241. The reversal of 21334239 is 93243312.

It is a happy number.

It is not a de Polignac number, because 21334239 - 2⁹ = 21333727 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21334219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15907 + ... + 17195.

It is an arithmetic number, because the mean of its divisors is an integer number (1980150).

Almost surely, 2^21334239 is an apocalyptic number.

21334239 is a deficient number, since it is larger than the sum of its proper divisors (10348161).

21334239 is a wasteful number, since it uses less digits than its factorization.

21334239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1911 (or 1905 counting only the distinct ones).

The product of its digits is 3888, while the sum is 27.

The square root of 21334239 is about 4618.9001937691. The cubic root of 21334239 is about 277.3484343984.

The spelling of 21334239 in words is "twenty-one million, three hundred thirty-four thousand, two hundred thirty-nine".