12021000111 has 12 divisors (see below), whose sum is σ = 17370433080. Its totient is φ = 8010877200.

The previous prime is 12021000091. The next prime is 12021000127. The reversal of 12021000111 is 11100012021.

It is a happy number.

It is not a de Polignac number, because 12021000111 - 2¹¹ = 12020998063 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 12021000093 and 12021000102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021000191) 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 in 11 ways as a sum of consecutive naturals, for example, 235740 + ... + 282161.

It is an arithmetic number, because the mean of its divisors is an integer number (1447536090).

Almost surely, 2^12021000111 is an apocalyptic number.

12021000111 is a deficient number, since it is larger than the sum of its proper divisors (5349432969).

12021000111 is a wasteful number, since it uses less digits than its factorization.

12021000111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520486 (or 520483 counting only the distinct ones).

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

Adding to 12021000111 its reverse (11100012021), we get a palindrome (23121012132).

The spelling of 12021000111 in words is "twelve billion, twenty-one million, one hundred eleven", and thus it is an aban number.