21212321331232 has 48 divisors (see below), whose sum is σ = 41883052942080. Its totient is φ = 10575362524672.

The previous prime is 21212321331217. The next prime is 21212321331241. The reversal of 21212321331232 is 23213312321212.

It is a self number, because there is not a number n which added to its sum of digits gives 21212321331232.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 100793988 + ... + 101004220.

It is an arithmetic number, because the mean of its divisors is an integer number (872563602960).

Almost surely, 2^{21212321331232} is an apocalyptic number.

It is an amenable number.

21212321331232 is a deficient number, since it is larger than the sum of its proper divisors (20670731610848).

21212321331232 is a wasteful number, since it uses less digits than its factorization.

21212321331232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219385 (or 219377 counting only the distinct ones).

The product of its digits is 5184, while the sum is 28.

Adding to 21212321331232 its reverse (23213312321212), we get a palindrome (44425633652444).

The spelling of 21212321331232 in words is "twenty-one trillion, two hundred twelve billion, three hundred twenty-one million, three hundred thirty-one thousand, two hundred thirty-two".