21334857 has 8 divisors (see below), whose sum is σ = 28670976. Its totient is φ = 14110992.

The previous prime is 21334849. The next prime is 21334867. The reversal of 21334857 is 75843312.

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

It is not a de Polignac number, because 21334857 - 2³ = 21334849 is a prime.

It is a super-3 number, since 3×21334857³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (21334867) 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, 27618 + ... + 28379.

It is an arithmetic number, because the mean of its divisors is an integer number (3583872).

Almost surely, 2^21334857 is an apocalyptic number.

It is an amenable number.

21334857 is a deficient number, since it is larger than the sum of its proper divisors (7336119).

21334857 is a wasteful number, since it uses less digits than its factorization.

21334857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56127.

The product of its digits is 20160, while the sum is 33.

The square root of 21334857 is about 4618.9670923270. The cubic root of 21334857 is about 277.3511124047.

The spelling of 21334857 in words is "twenty-one million, three hundred thirty-four thousand, eight hundred fifty-seven".