21023303 has 12 divisors (see below), whose sum is σ = 24533712. Its totient is φ = 17962560.

The previous prime is 21023287. The next prime is 21023309. The reversal of 21023303 is 30332012.

It is not a de Polignac number, because 21023303 - 2⁴ = 21023287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023309) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23423 + ... + 24303.

It is an arithmetic number, because the mean of its divisors is an integer number (2044476).

Almost surely, 2^21023303 is an apocalyptic number.

21023303 is a deficient number, since it is larger than the sum of its proper divisors (3510409).

21023303 is an equidigital number, since it uses as much as digits as its factorization.

21023303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1382 (or 1375 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 14.

The square root of 21023303 is about 4585.1175557449. The cubic root of 21023303 is about 275.9944294542.

Adding to 21023303 its reverse (30332012), we get a palindrome (51355315).

The spelling of 21023303 in words is "twenty-one million, twenty-three thousand, three hundred three".