21303003231 has 24 divisors (see below), whose sum is σ = 30983066400. Its totient is φ = 14104310976.

The previous prime is 21303003223. The next prime is 21303003247. The reversal of 21303003231 is 13230030312.

21303003231 is a `hidden beast` number, since 2 + 130 + 300 + 3 + 231 = 666.

It is not a de Polignac number, because 21303003231 - 2³ = 21303003223 is a prime.

It is a super-2 number, since 2×21303003231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21303103231) 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, 1498545 + ... + 1512693.

It is an arithmetic number, because the mean of its divisors is an integer number (1290961100).

Almost surely, 2^21303003231 is an apocalyptic number.

21303003231 is a deficient number, since it is larger than the sum of its proper divisors (9680063169).

21303003231 is a wasteful number, since it uses less digits than its factorization.

21303003231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15295 (or 15292 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

Adding to 21303003231 its reverse (13230030312), we get a palindrome (34533033543).

The spelling of 21303003231 in words is "twenty-one billion, three hundred three million, three thousand, two hundred thirty-one".