21313203 has 8 divisors (see below), whose sum is σ = 29653248.
Its totient is φ = 13590984.
The previous prime is 21313199. The next prime is 21313207. The reversal of 21313203 is 30231312.
Adding to 21313203 its reverse (30231312), we get a palindrome (51544515).
It is an interprime number because it is at equal distance from previous prime (21313199) and next prime (21313207).
It is a sphenic number, since it is the product of 3 distinct primes.
It is not a de Polignac number, because 21313203 - 22 = 21313199 is a prime.
It is not an unprimeable number, because it can be changed into a prime (21313207) 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, 154375 + ... + 154512.
It is an arithmetic number, because the mean of its divisors is an integer number (3706656).
Almost surely, 221313203 is an apocalyptic number.
21313203 is a gapful number since it is divisible by the number (23) formed by its first and last digit.
21313203 is a deficient number, since it is larger than the sum of its proper divisors (8340045).
21313203 is a wasteful number, since it uses less digits than its factorization.
21313203 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 308913.
The product of its (nonzero) digits is 108, while the sum is 15.
The square root of 21313203 is about 4616.6224666958.
The cubic root of 21313203 is about 277.2572473275.
The spelling of 21313203 in words is "twenty-one million, three hundred thirteen thousand, two hundred three".