21102010111 has 16 divisors (see below), whose sum is σ = 26083197504. Its totient is φ = 16624422144.

The previous prime is 21102010091. The next prime is 21102010117. The reversal of 21102010111 is 11101020112.

It is a cyclic number.

It is not a de Polignac number, because 21102010111 - 2⁵ = 21102010079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102010117) 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 15 ways as a sum of consecutive naturals, for example, 476416 + ... + 518821.

It is an arithmetic number, because the mean of its divisors is an integer number (1630199844).

Almost surely, 2^21102010111 is an apocalyptic number.

21102010111 is a deficient number, since it is larger than the sum of its proper divisors (4981187393).

21102010111 is a wasteful number, since it uses less digits than its factorization.

21102010111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 995490.

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

Adding to 21102010111 its reverse (11101020112), we get a palindrome (32203030223).

It can be divided in two parts, 211020101 and 11, that added together give a palindrome (211020112).

The spelling of 21102010111 in words is "twenty-one billion, one hundred two million, ten thousand, one hundred eleven".