21297803 has 8 divisors (see below), whose sum is σ = 23192400. Its totient is φ = 19480608.

The previous prime is 21297797. The next prime is 21297811. The reversal of 21297803 is 30879212.

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 21297803 - 2²⁴ = 4520587 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21297803.

It is not an unprimeable number, because it can be changed into a prime (21297853) 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 7 ways as a sum of consecutive naturals, for example, 18776 + ... + 19877.

It is an arithmetic number, because the mean of its divisors is an integer number (2899050).

Almost surely, 2^21297803 is an apocalyptic number.

21297803 is a deficient number, since it is larger than the sum of its proper divisors (1894597).

21297803 is a wasteful number, since it uses less digits than its factorization.

21297803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38701.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 21297803 is about 4614.9542792968. The cubic root of 21297803 is about 277.1904531998.

The spelling of 21297803 in words is "twenty-one million, two hundred ninety-seven thousand, eight hundred three".