21113300111 has 2 divisors, whose sum is σ = 21113300112. Its totient is φ = 21113300110.

The previous prime is 21113300071. The next prime is 21113300123. The reversal of 21113300111 is 11100331112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21113300111 - 2²⁶ = 21046191247 is a prime.

It is a super-2 number, since 2×21113300111² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21113380111) 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, 10556650055 + 10556650056.

It is an arithmetic number, because the mean of its divisors is an integer number (10556650056).

Almost surely, 2^21113300111 is an apocalyptic number.

21113300111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21113300111 is an equidigital number, since it uses as much as digits as its factorization.

21113300111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 14.

Adding to 21113300111 its reverse (11100331112), we get a palindrome (32213631223).

The spelling of 21113300111 in words is "twenty-one billion, one hundred thirteen million, three hundred thousand, one hundred eleven".