21303083 has 8 divisors (see below), whose sum is σ = 22831008. Its totient is φ = 19825344.

The previous prime is 21303059. The next prime is 21303109. The reversal of 21303083 is 38030312.

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 21303083 - 2¹² = 21298987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21303283) 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, 11666 + ... + 13367.

It is an arithmetic number, because the mean of its divisors is an integer number (2853876).

Almost surely, 2^21303083 is an apocalyptic number.

21303083 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21303083 is a deficient number, since it is larger than the sum of its proper divisors (1527925).

21303083 is a wasteful number, since it uses less digits than its factorization.

21303083 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25093.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 21303083 is about 4615.5262971843. The cubic root of 21303083 is about 277.2133576697.

Adding to 21303083 its reverse (38030312), we get a palindrome (59333395).

The spelling of 21303083 in words is "twenty-one million, three hundred three thousand, eighty-three".