21200011101111 has 32 divisors (see below), whose sum is σ = 29340598629888. Its totient is φ = 13604747990400.

The previous prime is 21200011101091. The next prime is 21200011101121. The reversal of 21200011101111 is 11110111000212.

It is not a de Polignac number, because 21200011101111 - 2¹⁰ = 21200011100087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200011101121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13882300 + ... + 15333566.

It is an arithmetic number, because the mean of its divisors is an integer number (916893707184).

Almost surely, 2^{21200011101111} is an apocalyptic number.

21200011101111 is a deficient number, since it is larger than the sum of its proper divisors (8140587528777).

21200011101111 is a wasteful number, since it uses less digits than its factorization.

21200011101111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1452711.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 21200011101111 its reverse (11110111000212), we get a palindrome (32310122101323).

The spelling of 21200011101111 in words is "twenty-one trillion, two hundred billion, eleven million, one hundred one thousand, one hundred eleven".