21200022111 has 16 divisors (see below), whose sum is σ = 29182466048. Its totient is φ = 13675586400.

The previous prime is 21200022097. The next prime is 21200022143. The reversal of 21200022111 is 11122000212.

It is not a de Polignac number, because 21200022111 - 2¹¹ = 21200020063 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 (21200022161) 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, 1143165 + ... + 1161561.

It is an arithmetic number, because the mean of its divisors is an integer number (1823904128).

Almost surely, 2^21200022111 is an apocalyptic number.

21200022111 is a deficient number, since it is larger than the sum of its proper divisors (7982443937).

21200022111 is a wasteful number, since it uses less digits than its factorization.

21200022111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30822.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21200022111 its reverse (11122000212), we get a palindrome (32322022323).

The spelling of 21200022111 in words is "twenty-one billion, two hundred million, twenty-two thousand, one hundred eleven".