21331111012 has 24 divisors (see below), whose sum is σ = 39530181600. Its totient is φ = 10036928640.

The previous prime is 21331111003. The next prime is 21331111013. The reversal of 21331111012 is 21011113312.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21331111013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 767739 + ... + 795037.

It is an arithmetic number, because the mean of its divisors is an integer number (1647090900).

Almost surely, 2^21331111012 is an apocalyptic number.

It is an amenable number.

21331111012 is a deficient number, since it is larger than the sum of its proper divisors (18199070588).

21331111012 is a wasteful number, since it uses less digits than its factorization.

21331111012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38811 (or 38809 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21331111012 its reverse (21011113312), we get a palindrome (42342224324).

The spelling of 21331111012 in words is "twenty-one billion, three hundred thirty-one million, one hundred eleven thousand, twelve".