21876803 has 4 divisors (see below), whose sum is σ = 23559648. Its totient is φ = 20193960.

The previous prime is 21876797. The next prime is 21876839. The reversal of 21876803 is 30867812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21876803 - 2²⁴ = 5099587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21876403) 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 3 ways as a sum of consecutive naturals, for example, 841403 + ... + 841428.

It is an arithmetic number, because the mean of its divisors is an integer number (5889912).

Almost surely, 2^21876803 is an apocalyptic number.

21876803 is a deficient number, since it is larger than the sum of its proper divisors (1682845).

21876803 is a wasteful number, since it uses less digits than its factorization.

21876803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1682844.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 21876803 is about 4677.2644783035. The cubic root of 21876803 is about 279.6799191042.

The spelling of 21876803 in words is "twenty-one million, eight hundred seventy-six thousand, eight hundred three".