21011100111312 has 40 divisors (see below), whose sum is σ = 55745666516256. Its totient is φ = 6814410846336.

The previous prime is 21011100111311. The next prime is 21011100111319. The reversal of 21011100111312 is 21311100111012.

It is a super-2 number, since 2×21011100111312² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21011100111291 and 21011100111300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011100111311) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5915285418 + ... + 5915288969.

Almost surely, 2^{21011100111312} is an apocalyptic number.

It is an amenable number.

21011100111312 is an abundant number, since it is smaller than the sum of its proper divisors (34734566404944).

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

21011100111312 is a wasteful number, since it uses less digits than its factorization.

21011100111312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11830574435 (or 11830574429 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 15.

Adding to 21011100111312 its reverse (21311100111012), we get a palindrome (42322200222324).

The spelling of 21011100111312 in words is "twenty-one trillion, eleven billion, one hundred million, one hundred eleven thousand, three hundred twelve".