21872303 has 8 divisors (see below), whose sum is σ = 22323600. Its totient is φ = 21423808.

The previous prime is 21872281. The next prime is 21872309. The reversal of 21872303 is 30327812.

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 21872303 - 2¹⁴ = 21855919 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21872309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22475 + ... + 23427.

It is an arithmetic number, because the mean of its divisors is an integer number (2790450).

Almost surely, 2^21872303 is an apocalyptic number.

21872303 is a deficient number, since it is larger than the sum of its proper divisors (451297).

21872303 is an equidigital number, since it uses as much as digits as its factorization.

21872303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1401.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 21872303 is about 4676.7834031522. The cubic root of 21872303 is about 279.6607413181.

The spelling of 21872303 in words is "twenty-one million, eight hundred seventy-two thousand, three hundred three".