21211100111000 has 32 divisors (see below), whose sum is σ = 49633974262080. Its totient is φ = 8484440044000.

The previous prime is 21211100110973. The next prime is 21211100111017. The reversal of 21211100111000 is 11100111212.

21211100111000 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10605549056 + ... + 10605551055.

It is an arithmetic number, because the mean of its divisors is an integer number (1551061695690).

Almost surely, 2^{21211100111000} is an apocalyptic number.

21211100111000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21211100111000 is an abundant number, since it is smaller than the sum of its proper divisors (28422874151080).

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

21211100111000 is a wasteful number, since it uses less digits than its factorization.

21211100111000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21211100132 (or 21211100118 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21211100111000 its reverse (11100111212), we get a palindrome (21222200222212).

The spelling of 21211100111000 in words is "twenty-one trillion, two hundred eleven billion, one hundred million, one hundred eleven thousand".