21131332321212 has 36 divisors (see below), whose sum is σ = 53415799917480. Its totient is φ = 7043713133472.

The previous prime is 21131332321189. The next prime is 21131332321217. The reversal of 21131332321212 is 21212323313112.

21131332321212 is a `hidden beast` number, since 2 + 1 + 1 + 3 + 1 + 332 + 321 + 2 + 1 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131332321217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1403763 + ... + 6650805.

It is an arithmetic number, because the mean of its divisors is an integer number (1483772219930).

Almost surely, 2^{21131332321212} is an apocalyptic number.

It is an amenable number.

21131332321212 is an abundant number, since it is smaller than the sum of its proper divisors (32284467596268).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21131332321212 is a wasteful number, since it uses less digits than its factorization.

21131332321212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5358922 (or 5358917 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

Adding to 21131332321212 its reverse (21212323313112), we get a palindrome (42343655634324).

The spelling of 21131332321212 in words is "twenty-one trillion, one hundred thirty-one billion, three hundred thirty-two million, three hundred twenty-one thousand, two hundred twelve".