21335873 has 8 divisors (see below), whose sum is σ = 23159808. Its totient is φ = 19538064.

The previous prime is 21335863. The next prime is 21335887. The reversal of 21335873 is 37853312.

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

It is not a de Polignac number, because 21335873 - 2⁴ = 21335857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21335813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4811 + ... + 8112.

It is an arithmetic number, because the mean of its divisors is an integer number (2894976).

Almost surely, 2^21335873 is an apocalyptic number.

It is an amenable number.

21335873 is a deficient number, since it is larger than the sum of its proper divisors (1823935).

21335873 is a wasteful number, since it uses less digits than its factorization.

21335873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13063.

The product of its digits is 15120, while the sum is 32.

The square root of 21335873 is about 4619.0770723165. The cubic root of 21335873 is about 277.3555149693.

The spelling of 21335873 in words is "twenty-one million, three hundred thirty-five thousand, eight hundred seventy-three".