21202110111 has 64 divisors (see below), whose sum is σ = 35864665088. Its totient is φ = 10841361408.

The previous prime is 21202110107. The next prime is 21202110119. The reversal of 21202110111 is 11101120212.

It is not a de Polignac number, because 21202110111 - 2² = 21202110107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202110119) 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 63 ways as a sum of consecutive naturals, for example, 2854875 + ... + 2862291.

It is an arithmetic number, because the mean of its divisors is an integer number (560385392).

Almost surely, 2^21202110111 is an apocalyptic number.

21202110111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21202110111 is a deficient number, since it is larger than the sum of its proper divisors (14662554977).

21202110111 is a wasteful number, since it uses less digits than its factorization.

21202110111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7760.

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

Adding to 21202110111 its reverse (11101120212), we get a palindrome (32303230323).

The spelling of 21202110111 in words is "twenty-one billion, two hundred two million, one hundred ten thousand, one hundred eleven".