21384853 has 8 divisors (see below), whose sum is σ = 25100672. Its totient is φ = 17834256.

The previous prime is 21384841. The next prime is 21384877. The reversal of 21384853 is 35848312.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21384853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21384893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41025 + ... + 41542.

It is an arithmetic number, because the mean of its divisors is an integer number (3137584).

Almost surely, 2^21384853 is an apocalyptic number.

It is an amenable number.

21384853 is a deficient number, since it is larger than the sum of its proper divisors (3715819).

21384853 is an equidigital number, since it uses as much as digits as its factorization.

21384853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82611.

The product of its digits is 23040, while the sum is 34.

The square root of 21384853 is about 4624.3759578996. The cubic root of 21384853 is about 277.5675911430.

The spelling of 21384853 in words is "twenty-one million, three hundred eighty-four thousand, eight hundred fifty-three".