1211021201111 has 4 divisors (see below), whose sum is σ = 1211351093424. Its totient is φ = 1210691308800.

The previous prime is 1211021201087. The next prime is 1211021201171. The reversal of 1211021201111 is 1111021201121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211021201111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211021201171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164940650 + ... + 164947991.

It is an arithmetic number, because the mean of its divisors is an integer number (302837773356).

Almost surely, 2^{1211021201111} is an apocalyptic number.

1211021201111 is a deficient number, since it is larger than the sum of its proper divisors (329892313).

1211021201111 is an equidigital number, since it uses as much as digits as its factorization.

1211021201111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329892312.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 1211021201111 its reverse (1111021201121), we get a palindrome (2322042402232).

The spelling of 1211021201111 in words is "one trillion, two hundred eleven billion, twenty-one million, two hundred one thousand, one hundred eleven".