1200021021111 has 8 divisors (see below), whose sum is σ = 1745485121664. Its totient is φ = 727285467320.

The previous prime is 1200021021077. The next prime is 1200021021137. The reversal of 1200021021111 is 1111201200021.

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

It is a cyclic number.

It is not a de Polignac number, because 1200021021111 - 2⁷ = 1200021020983 is a prime.

It is a super-2 number, since 2×1200021021111² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200021021181) 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, 18182136651 + ... + 18182136716.

It is an arithmetic number, because the mean of its divisors is an integer number (218185640208).

Almost surely, 2^{1200021021111} is an apocalyptic number.

1200021021111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1200021021111 is a deficient number, since it is larger than the sum of its proper divisors (545464100553).

1200021021111 is a wasteful number, since it uses less digits than its factorization.

1200021021111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36364273381.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1200021021111 its reverse (1111201200021), we get a palindrome (2311222221132).

The spelling of 1200021021111 in words is "one trillion, two hundred billion, twenty-one million, twenty-one thousand, one hundred eleven".