21078853 has 8 divisors (see below), whose sum is σ = 22510080. Its totient is φ = 19694640.

The previous prime is 21078851. The next prime is 21078857. The reversal of 21078853 is 35887012.

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

It is a cyclic number.

It is not a de Polignac number, because 21078853 - 2¹ = 21078851 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 (21078851) 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, 10825 + ... + 12622.

It is an arithmetic number, because the mean of its divisors is an integer number (2813760).

Almost surely, 2^21078853 is an apocalyptic number.

It is an amenable number.

21078853 is a deficient number, since it is larger than the sum of its proper divisors (1431227).

21078853 is a wasteful number, since it uses less digits than its factorization.

21078853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23507.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 21078853 is about 4591.1712013385. The cubic root of 21078853 is about 276.2373029114.

The spelling of 21078853 in words is "twenty-one million, seventy-eight thousand, eight hundred fifty-three".