21000011101100 has 36 divisors (see below), whose sum is σ = 45808610644608. Its totient is φ = 8356025352000.

The previous prime is 21000011101051. The next prime is 21000011101129. The reversal of 21000011101100 is 110111000012.

It is a happy number.

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 11 ways as a sum of consecutive naturals, for example, 549719411 + ... + 549757610.

Almost surely, 2^{21000011101100} is an apocalyptic number.

21000011101100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000011101100 is an abundant number, since it is smaller than the sum of its proper divisors (24808599543508).

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

21000011101100 is a wasteful number, since it uses less digits than its factorization.

21000011101100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1099477226 (or 1099477219 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 21000011101100 its reverse (110111000012), we get a palindrome (21110122101112).

The spelling of 21000011101100 in words is "twenty-one trillion, eleven million, one hundred one thousand, one hundred".