1211200021111 has 8 divisors (see below), whose sum is σ = 1254283229664. Its totient is φ = 1168866085920.

The previous prime is 1211200021033. The next prime is 1211200021153. The reversal of 1211200021111 is 1111200021121.

It is a happy number.

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 1211200021111 - 2¹¹ = 1211200019063 is a prime.

It is a super-2 number, since 2×1211200021111² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211200021091 and 1211200021100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211200001111) 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 7 ways as a sum of consecutive naturals, for example, 187315051 + ... + 187321516.

It is an arithmetic number, because the mean of its divisors is an integer number (156785403708).

Almost surely, 2^{1211200021111} is an apocalyptic number.

1211200021111 is a deficient number, since it is larger than the sum of its proper divisors (43083208553).

1211200021111 is an equidigital number, since it uses as much as digits as its factorization.

1211200021111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374636681.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1211200021111 its reverse (1111200021121), we get a palindrome (2322400042232).

The spelling of 1211200021111 in words is "one trillion, two hundred eleven billion, two hundred million, twenty-one thousand, one hundred eleven".