21002200111 has 4 divisors (see below), whose sum is σ = 21083920992. Its totient is φ = 20920479232.

The previous prime is 21002200099. The next prime is 21002200117. The reversal of 21002200111 is 11100220012.

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 21002200111 - 2⁷ = 21002199983 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 (21002200117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40860055 + ... + 40860568.

It is an arithmetic number, because the mean of its divisors is an integer number (5270980248).

Almost surely, 2^21002200111 is an apocalyptic number.

21002200111 is a deficient number, since it is larger than the sum of its proper divisors (81720881).

21002200111 is an equidigital number, since it uses as much as digits as its factorization.

21002200111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81720880.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21002200111 its reverse (11100220012), we get a palindrome (32102420123).

It can be divided in two parts, 2100220011 and 1, that added together give a palindrome (2100220012).

The spelling of 21002200111 in words is "twenty-one billion, two million, two hundred thousand, one hundred eleven".