21102001001111 has 4 divisors (see below), whose sum is σ = 21356241977112. Its totient is φ = 20847760025112.

The previous prime is 21102001001077. The next prime is 21102001001161. The reversal of 21102001001111 is 11110010020112.

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 21102001001111 - 2⁴² = 16703954490007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21102001001092 and 21102001001101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102001001161) 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 3 ways as a sum of consecutive naturals, for example, 127120487876 + ... + 127120488041.

It is an arithmetic number, because the mean of its divisors is an integer number (5339060494278).

Almost surely, 2^{21102001001111} is an apocalyptic number.

21102001001111 is a deficient number, since it is larger than the sum of its proper divisors (254240976001).

21102001001111 is an equidigital number, since it uses as much as digits as its factorization.

21102001001111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254240976000.

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

Adding to 21102001001111 its reverse (11110010020112), we get a palindrome (32212011021223).

The spelling of 21102001001111 in words is "twenty-one trillion, one hundred two billion, one million, one thousand, one hundred eleven".