21010200110111 has 4 divisors (see below), whose sum is σ = 21010212926472. Its totient is φ = 21010187293752.

The previous prime is 21010200110083. The next prime is 21010200110113. The reversal of 21010200110111 is 11101100201012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21010200110111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21010200110092 and 21010200110101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010200110113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3513260 + ... + 7373153.

It is an arithmetic number, because the mean of its divisors is an integer number (5252553231618).

Almost surely, 2^{21010200110111} is an apocalyptic number.

21010200110111 is a deficient number, since it is larger than the sum of its proper divisors (12816361).

21010200110111 is a wasteful number, since it uses less digits than its factorization.

21010200110111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12816360.

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

Adding to 21010200110111 its reverse (11101100201012), we get a palindrome (32111300311123).

Subtracting from 21010200110111 its reverse (11101100201012), we obtain a palindrome (9909099909099).

The spelling of 21010200110111 in words is "twenty-one trillion, ten billion, two hundred million, one hundred ten thousand, one hundred eleven".