21675803 has 8 divisors (see below), whose sum is σ = 22065120. Its totient is φ = 21288960.

The previous prime is 21675791. The next prime is 21675809. The reversal of 21675803 is 30857612.

It is a happy number.

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 21675803 - 2¹⁴ = 21659419 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 21675803.

It is not an unprimeable number, because it can be changed into a prime (21675809) 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, 27803 + ... + 28571.

It is an arithmetic number, because the mean of its divisors is an integer number (2758140).

Almost surely, 2^21675803 is an apocalyptic number.

21675803 is a deficient number, since it is larger than the sum of its proper divisors (389317).

21675803 is an equidigital number, since it uses as much as digits as its factorization.

21675803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1237.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 21675803 is about 4655.7279774489. The cubic root of 21675803 is about 278.8207333217.

The spelling of 21675803 in words is "twenty-one million, six hundred seventy-five thousand, eight hundred three".