21200113111 has 2 divisors, whose sum is σ = 21200113112. Its totient is φ = 21200113110.

The previous prime is 21200113091. The next prime is 21200113117. The reversal of 21200113111 is 11131100212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21200113111 - 2²⁹ = 20663242199 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21200113091 and 21200113100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21200113117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600056555 + 10600056556.

It is an arithmetic number, because the mean of its divisors is an integer number (10600056556).

Almost surely, 2^21200113111 is an apocalyptic number.

21200113111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21200113111 is an equidigital number, since it uses as much as digits as its factorization.

21200113111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 21200113111 its reverse (11131100212), we get a palindrome (32331213323).

The spelling of 21200113111 in words is "twenty-one billion, two hundred million, one hundred thirteen thousand, one hundred eleven".