21131330012 has 48 divisors (see below), whose sum is σ = 40115712000. Its totient is φ = 9681819840.

The previous prime is 21131329993. The next prime is 21131330029. The reversal of 21131330012 is 21003313112.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 5078789 + ... + 5082947.

It is an arithmetic number, because the mean of its divisors is an integer number (835744000).

Almost surely, 2^21131330012 is an apocalyptic number.

It is an amenable number.

21131330012 is a deficient number, since it is larger than the sum of its proper divisors (18984381988).

21131330012 is a wasteful number, since it uses less digits than its factorization.

21131330012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4866 (or 4864 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21131330012 its reverse (21003313112), we get a palindrome (42134643124).

The spelling of 21131330012 in words is "twenty-one billion, one hundred thirty-one million, three hundred thirty thousand, twelve".