21311033012 has 12 divisors (see below), whose sum is σ = 37298224740. Its totient is φ = 10654397376.

The previous prime is 21311032913. The next prime is 21311033033. The reversal of 21311033012 is 21033011312.

It can be written as a sum of positive squares in 2 ways, for example, as 15132444196 + 6178588816 = 123014^2 + 78604^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 236183 + ... + 313694.

It is an arithmetic number, because the mean of its divisors is an integer number (3108185395).

Almost surely, 2^21311033012 is an apocalyptic number.

It is an amenable number.

21311033012 is a deficient number, since it is larger than the sum of its proper divisors (15987191728).

21311033012 is a wasteful number, since it uses less digits than its factorization.

21311033012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559570 (or 559568 counting only the distinct ones).

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

Adding to 21311033012 its reverse (21033011312), we get a palindrome (42344044324).

The spelling of 21311033012 in words is "twenty-one billion, three hundred eleven million, thirty-three thousand, twelve".