21231111303 has 24 divisors (see below), whose sum is σ = 32264218896. Its totient is φ = 13435632000.

The previous prime is 21231111287. The next prime is 21231111367. The reversal of 21231111303 is 30311113212.

21231111303 is a `hidden beast` number, since 21 + 231 + 111 + 303 = 666.

It is not a de Polignac number, because 21231111303 - 2⁴ = 21231111287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231111703) 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 23 ways as a sum of consecutive naturals, for example, 763873 + ... + 791178.

It is an arithmetic number, because the mean of its divisors is an integer number (1344342454).

Almost surely, 2^21231111303 is an apocalyptic number.

21231111303 is a deficient number, since it is larger than the sum of its proper divisors (11033107593).

21231111303 is a wasteful number, since it uses less digits than its factorization.

21231111303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1555135 (or 1555132 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21231111303 its reverse (30311113212), we get a palindrome (51542224515).

The spelling of 21231111303 in words is "twenty-one billion, two hundred thirty-one million, one hundred eleven thousand, three hundred three".