21231303 has 16 divisors (see below), whose sum is σ = 30606720. Its totient is φ = 13045536.

The previous prime is 21231269. The next prime is 21231307. The reversal of 21231303 is 30313212.

It is not a de Polignac number, because 21231303 - 2⁹ = 21230791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231307) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2925 + ... + 7142.

It is an arithmetic number, because the mean of its divisors is an integer number (1912920).

Almost surely, 2^21231303 is an apocalyptic number.

21231303 is a deficient number, since it is larger than the sum of its proper divisors (9375417).

21231303 is a wasteful number, since it uses less digits than its factorization.

21231303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10126.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 21231303 is about 4607.7438079824. The cubic root of 21231303 is about 276.9016537143.

Adding to 21231303 its reverse (30313212), we get a palindrome (51544515).

The spelling of 21231303 in words is "twenty-one million, two hundred thirty-one thousand, three hundred three".