21213313232 has 40 divisors (see below), whose sum is σ = 41304142080. Its totient is φ = 10554289920.

The previous prime is 21213313223. The next prime is 21213313243. The reversal of 21213313232 is 23231331212.

It is a junction number, because it is equal to n+sod(n) for n = 21213313198 and 21213313207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3660257 + ... + 3666047.

It is an arithmetic number, because the mean of its divisors is an integer number (1032603552).

Almost surely, 2^21213313232 is an apocalyptic number.

It is an amenable number.

21213313232 is a deficient number, since it is larger than the sum of its proper divisors (20090828848).

21213313232 is a wasteful number, since it uses less digits than its factorization.

21213313232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6891 (or 6885 counting only the distinct ones).

The product of its digits is 1296, while the sum is 23.

Adding to 21213313232 its reverse (23231331212), we get a palindrome (44444644444).

The spelling of 21213313232 in words is "twenty-one billion, two hundred thirteen million, three hundred thirteen thousand, two hundred thirty-two".