21331232012 has 12 divisors (see below), whose sum is σ = 37330691496. Its totient is φ = 10665320160.

The previous prime is 21331232003. The next prime is 21331232023. The reversal of 21331232012 is 21023213312.

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 3 ways as a sum of consecutive naturals, for example, 206087 + ... + 291777.

It is an arithmetic number, because the mean of its divisors is an integer number (3110890958).

Almost surely, 2^21331232012 is an apocalyptic number.

It is an amenable number.

21331232012 is a deficient number, since it is larger than the sum of its proper divisors (15999459484).

21331232012 is a wasteful number, since it uses less digits than its factorization.

21331232012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147928 (or 147926 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21331232012 its reverse (21023213312), we get a palindrome (42354445324).

The spelling of 21331232012 in words is "twenty-one billion, three hundred thirty-one million, two hundred thirty-two thousand, twelve".