21213231303 has 16 divisors (see below), whose sum is σ = 30929270400. Its totient is φ = 12825811680.

The previous prime is 21213231289. The next prime is 21213231337. The reversal of 21213231303 is 30313231212.

It is not a de Polignac number, because 21213231303 - 2⁶ = 21213231239 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21213231303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213231353) 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, 753268 + ... + 780921.

It is an arithmetic number, because the mean of its divisors is an integer number (1933079400).

Almost surely, 2^21213231303 is an apocalyptic number.

21213231303 is a deficient number, since it is larger than the sum of its proper divisors (9716039097).

21213231303 is a wasteful number, since it uses less digits than its factorization.

21213231303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1534622.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21213231303 its reverse (30313231212), we get a palindrome (51526462515).

Subtracting 21213231303 from its reverse (30313231212), we obtain a palindrome (9099999909).

The spelling of 21213231303 in words is "twenty-one billion, two hundred thirteen million, two hundred thirty-one thousand, three hundred three".