21011111110994 has 16 divisors (see below), whose sum is σ = 33147169816320. Its totient is φ = 9974842765680.

The previous prime is 21011111110993. The next prime is 21011111111027. The reversal of 21011111110994 is 49901111111012.

It is a happy number.

It is a super-3 number, since 3×21011111110994³ (a number of 41 digits) contains 333 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21011111110994.

It is not an unprimeable number, because it can be changed into a prime (21011111110993) 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, 3197061704 + ... + 3197068275.

It is an arithmetic number, because the mean of its divisors is an integer number (2071698113520).

Almost surely, 2^{21011111110994} is an apocalyptic number.

21011111110994 is a deficient number, since it is larger than the sum of its proper divisors (12136058705326).

21011111110994 is a wasteful number, since it uses less digits than its factorization.

21011111110994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6394130065.

The product of its (nonzero) digits is 648, while the sum is 32.

The spelling of 21011111110994 in words is "twenty-one trillion, eleven billion, one hundred eleven million, one hundred ten thousand, nine hundred ninety-four".