21111011100188 has 24 divisors (see below), whose sum is σ = 40027170162672. Its totient is φ = 9703556400384.

The previous prime is 21111011100187. The next prime is 21111011100229. The reversal of 21111011100188 is 88100111011112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111011100187) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 3609951095 + ... + 3609956942.

It is an arithmetic number, because the mean of its divisors is an integer number (1667798756778).

Almost surely, 2^{21111011100188} is an apocalyptic number.

It is an amenable number.

21111011100188 is a deficient number, since it is larger than the sum of its proper divisors (18916159062484).

21111011100188 is a wasteful number, since it uses less digits than its factorization.

21111011100188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7219908101 (or 7219908099 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 26.

The spelling of 21111011100188 in words is "twenty-one trillion, one hundred eleven billion, eleven million, one hundred thousand, one hundred eighty-eight".