21480803 has 4 divisors (see below), whose sum is σ = 21801480. Its totient is φ = 21160128.

The previous prime is 21480791. The next prime is 21480817. The reversal of 21480803 is 30808412.

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 21480803 - 2¹⁰ = 21479779 is a prime.

It is a super-2 number, since 2×21480803² = 922849795049618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21480863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160238 + ... + 160371.

It is an arithmetic number, because the mean of its divisors is an integer number (5450370).

Almost surely, 2^21480803 is an apocalyptic number.

21480803 is a deficient number, since it is larger than the sum of its proper divisors (320677).

21480803 is an equidigital number, since it uses as much as digits as its factorization.

21480803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320676.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 21480803 is about 4634.7387197123. The cubic root of 21480803 is about 277.9821038115.

The spelling of 21480803 in words is "twenty-one million, four hundred eighty thousand, eight hundred three".