21000102120111 has 4 divisors (see below), whose sum is σ = 28000136160152. Its totient is φ = 14000068080072.

The previous prime is 21000102120091. The next prime is 21000102120113. The reversal of 21000102120111 is 11102120100012.

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

It is not a de Polignac number, because 21000102120111 - 2⁵ = 21000102120079 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 (21000102120113) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3500017020016 + ... + 3500017020021.

It is an arithmetic number, because the mean of its divisors is an integer number (7000034040038).

Almost surely, 2^{21000102120111} is an apocalyptic number.

21000102120111 is a deficient number, since it is larger than the sum of its proper divisors (7000034040041).

21000102120111 is an equidigital number, since it uses as much as digits as its factorization.

21000102120111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7000034040040.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21000102120111 its reverse (11102120100012), we get a palindrome (32102222220123).

The spelling of 21000102120111 in words is "twenty-one trillion, one hundred two million, one hundred twenty thousand, one hundred eleven".