21112111020111 has 8 divisors (see below), whose sum is σ = 28149588903600. Its totient is φ = 14074686908352.

The previous prime is 21112111020109. The next prime is 21112111020131. The reversal of 21112111020111 is 11102011121112.

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

It is not a de Polignac number, because 21112111020111 - 2¹ = 21112111020109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112111020101) 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, 12517710 + ... + 14103803.

It is an arithmetic number, because the mean of its divisors is an integer number (3518698612950).

Almost surely, 2^{21112111020111} is an apocalyptic number.

21112111020111 is a deficient number, since it is larger than the sum of its proper divisors (7037477883489).

21112111020111 is a wasteful number, since it uses less digits than its factorization.

21112111020111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26885865.

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

Adding to 21112111020111 its reverse (11102011121112), we get a palindrome (32214122141223).

It can be divided in two parts, 21112 and 111020111, that multiplied together give a palindrome (2343856583432).

The spelling of 21112111020111 in words is "twenty-one trillion, one hundred twelve billion, one hundred eleven million, twenty thousand, one hundred eleven".