21111121200111 has 8 divisors (see below), whose sum is σ = 29056166813184. Its totient is φ = 13620078193560.

The previous prime is 21111121200079. The next prime is 21111121200137. The reversal of 21111121200111 is 11100212111112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21111121200111 - 2⁵ = 21111121200079 is a prime.

It is a super-2 number, since 2×21111121200111² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111121200151) 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 7 ways as a sum of consecutive naturals, for example, 113500651521 + ... + 113500651706.

It is an arithmetic number, because the mean of its divisors is an integer number (3632020851648).

Almost surely, 2^{21111121200111} is an apocalyptic number.

21111121200111 is a deficient number, since it is larger than the sum of its proper divisors (7945045613073).

21111121200111 is a wasteful number, since it uses less digits than its factorization.

21111121200111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227001303261.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 21111121200111 its reverse (11100212111112), we get a palindrome (32211333311223).

The spelling of 21111121200111 in words is "twenty-one trillion, one hundred eleven billion, one hundred twenty-one million, two hundred thousand, one hundred eleven".