21111200000012 has 24 divisors (see below), whose sum is σ = 37154412288000. Its totient is φ = 10495702397840.

The previous prime is 21111199999999. The next prime is 21111200000071. The reversal of 21111200000012 is 21000000211112.

It is a junction number, because it is equal to n+sod(n) for n = 21111199999939 and 21111200000002.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4362512 + ... + 7826487.

It is an arithmetic number, because the mean of its divisors is an integer number (1548100512000).

Almost surely, 2^{21111200000012} is an apocalyptic number.

It is an amenable number.

21111200000012 is a deficient number, since it is larger than the sum of its proper divisors (16043212287988).

21111200000012 is a wasteful number, since it uses less digits than its factorization.

21111200000012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12191461 (or 12191459 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21111200000012 its reverse (21000000211112), we get a palindrome (42111200211124).

The spelling of 21111200000012 in words is "twenty-one trillion, one hundred eleven billion, two hundred million, twelve", and thus it is an aban number.