21212013303 has 24 divisors (see below), whose sum is σ = 33537402080. Its totient is φ = 12839549760.

The previous prime is 21212013299. The next prime is 21212013323. The reversal of 21212013303 is 30331021212.

21212013303 is a `hidden beast` number, since 212 + 120 + 1 + 330 + 3 = 666.

It is not a de Polignac number, because 21212013303 - 2² = 21212013299 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212013323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1478923 + ... + 1493196.

Almost surely, 2^21212013303 is an apocalyptic number.

21212013303 is a deficient number, since it is larger than the sum of its proper divisors (12325388777).

21212013303 is a wasteful number, since it uses less digits than its factorization.

21212013303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2972199 (or 2972196 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21212013303 its reverse (30331021212), we get a palindrome (51543034515).

The spelling of 21212013303 in words is "twenty-one billion, two hundred twelve million, thirteen thousand, three hundred three".