12100020111 has 8 divisors (see below), whose sum is σ = 17925955760. Its totient is φ = 8066680056.

The previous prime is 12100020109. The next prime is 12100020143. The reversal of 12100020111 is 11102000121.

It is a happy number.

It is not a de Polignac number, because 12100020111 - 2¹ = 12100020109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12100020093 and 12100020102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12100021111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 224074420 + ... + 224074473.

It is an arithmetic number, because the mean of its divisors is an integer number (2240744470).

Almost surely, 2^12100020111 is an apocalyptic number.

12100020111 is a deficient number, since it is larger than the sum of its proper divisors (5825935649).

12100020111 is an equidigital number, since it uses as much as digits as its factorization.

12100020111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448148902 (or 448148896 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 12100020111 its reverse (11102000121), we get a palindrome (23202020232).

The spelling of 12100020111 in words is "twelve billion, one hundred million, twenty thousand, one hundred eleven".