1111200000021 has 48 divisors (see below), whose sum is σ = 1709690464768. Its totient is φ = 694220284800.

The previous prime is 1111200000007. The next prime is 1111200000041. The reversal of 1111200000021 is 1200000021111.

It is a happy number.

It is not a de Polignac number, because 1111200000021 - 2⁷ = 1111199999893 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 Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1111199999949 and 1111200000012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111200000041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1923075 + ... + 2433231.

Almost surely, 2^{1111200000021} is an apocalyptic number.

It is an amenable number.

1111200000021 is a deficient number, since it is larger than the sum of its proper divisors (598490464747).

1111200000021 is a wasteful number, since it uses less digits than its factorization.

1111200000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510442 (or 510439 counting only the distinct ones).

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

Adding to 1111200000021 its reverse (1200000021111), we get a palindrome (2311200021132).

It can be divided in two parts, 111 and 1200000021, that multiplied together give a palindrome (133200002331).

The spelling of 1111200000021 in words is "one trillion, one hundred eleven billion, two hundred million, twenty-one", and thus it is an aban number.