21111111120012 has 12 divisors (see below), whose sum is σ = 49259259280056. Its totient is φ = 7037037040000.

The previous prime is 21111111119999. The next prime is 21111111120031. The reversal of 21111111120012 is 21002111111112.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 21111111119973 and 21111111120000.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 879629629989 + ... + 879629630012.

It is an arithmetic number, because the mean of its divisors is an integer number (4104938273338).

Almost surely, 2^{21111111120012} is an apocalyptic number.

It is an amenable number.

21111111120012 is an abundant number, since it is smaller than the sum of its proper divisors (28148148160044).

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

21111111120012 is a wasteful number, since it uses less digits than its factorization.

21111111120012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1759259260008 (or 1759259260006 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 21111111120012 its reverse (21002111111112), we get a palindrome (42113222231124).

The spelling of 21111111120012 in words is "twenty-one trillion, one hundred eleven billion, one hundred eleven million, one hundred twenty thousand, twelve".