21376803 has 16 divisors (see below), whose sum is σ = 34490880. Its totient is φ = 11496576.

The previous prime is 21376801. The next prime is 21376807. The reversal of 21376803 is 30867312.

It is not a de Polignac number, because 21376803 - 2¹ = 21376801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21376801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29583 + ... + 30296.

It is an arithmetic number, because the mean of its divisors is an integer number (2155680).

Almost surely, 2^21376803 is an apocalyptic number.

21376803 is a deficient number, since it is larger than the sum of its proper divisors (13114077).

21376803 is a wasteful number, since it uses less digits than its factorization.

21376803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59906.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 21376803 is about 4623.5054882632. The cubic root of 21376803 is about 277.5327580840.

The spelling of 21376803 in words is "twenty-one million, three hundred seventy-six thousand, eight hundred three".