21337842 has 8 divisors (see below), whose sum is σ = 42675696. Its totient is φ = 7112612.

The previous prime is 21337837. The next prime is 21337867. The reversal of 21337842 is 24873312.

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

21337842 is an admirable number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1778148 + ... + 1778159.

It is an arithmetic number, because the mean of its divisors is an integer number (5334462).

Almost surely, 2^21337842 is an apocalyptic number.

21337842 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21337842 is a wasteful number, since it uses less digits than its factorization.

21337842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3556312.

The product of its digits is 8064, while the sum is 30.

The square root of 21337842 is about 4619.2902052155. The cubic root of 21337842 is about 277.3640467069.

The spelling of 21337842 in words is "twenty-one million, three hundred thirty-seven thousand, eight hundred forty-two".