21111111020012 has 48 divisors (see below), whose sum is σ = 40625733124032. Its totient is φ = 9539968803840.

The previous prime is 21111111019967. The next prime is 21111111020053. The reversal of 21111111020012 is 21002011111112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19777064 + ... + 20817167.

It is an arithmetic number, because the mean of its divisors is an integer number (846369440084).

Almost surely, 2^{21111111020012} is an apocalyptic number.

It is an amenable number.

21111111020012 is a deficient number, since it is larger than the sum of its proper divisors (19514622104020).

21111111020012 is a wasteful number, since it uses less digits than its factorization.

21111111020012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40594458 (or 40594456 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21111111020012 its reverse (21002011111112), we get a palindrome (42113122131124).

The spelling of 21111111020012 in words is "twenty-one trillion, one hundred eleven billion, one hundred eleven million, twenty thousand, twelve".