21100100020111 has 4 divisors (see below), whose sum is σ = 24114400022992. Its totient is φ = 18085800017232.

The previous prime is 21100100020099. The next prime is 21100100020249. The reversal of 21100100020111 is 11102000100112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21100100020111 - 2⁴³ = 12304006997903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100100050111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1507150001430 + ... + 1507150001443.

It is an arithmetic number, because the mean of its divisors is an integer number (6028600005748).

Almost surely, 2^{21100100020111} is an apocalyptic number.

21100100020111 is a deficient number, since it is larger than the sum of its proper divisors (3014300002881).

21100100020111 is an equidigital number, since it uses as much as digits as its factorization.

21100100020111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3014300002880.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21100100020111 its reverse (11102000100112), we get a palindrome (32202100120223).

The spelling of 21100100020111 in words is "twenty-one trillion, one hundred billion, one hundred million, twenty thousand, one hundred eleven".