1200021000111 has 24 divisors (see below), whose sum is σ = 1780333436960. Its totient is φ = 778338611136.

The previous prime is 1200021000109. The next prime is 1200021000169. The reversal of 1200021000111 is 1110001200021.

It is a happy number.

It is not a de Polignac number, because 1200021000111 - 2¹ = 1200021000109 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 = 1200021000093 and 1200021000102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200021000811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5065341 + ... + 5296953.

Almost surely, 2^{1200021000111} is an apocalyptic number.

1200021000111 is a deficient number, since it is larger than the sum of its proper divisors (580312436849).

1200021000111 is a wasteful number, since it uses less digits than its factorization.

1200021000111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247215 (or 247212 counting only the distinct ones).

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

Adding to 1200021000111 its reverse (1110001200021), we get a palindrome (2310022200132).

The spelling of 1200021000111 in words is "one trillion, two hundred billion, twenty-one million, one hundred eleven", and thus it is an aban number.