1211310320111 has 4 divisors (see below), whose sum is σ = 1211319644424. Its totient is φ = 1211300995800.

The previous prime is 1211310320089. The next prime is 1211310320137. The reversal of 1211310320111 is 1110230131121.

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

It is a cyclic number.

It is not a de Polignac number, because 1211310320111 - 2²⁶ = 1211243211247 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211310320111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211310320711) 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, 4464500 + ... + 4728041.

It is an arithmetic number, because the mean of its divisors is an integer number (302829911106).

Almost surely, 2^{1211310320111} is an apocalyptic number.

1211310320111 is a deficient number, since it is larger than the sum of its proper divisors (9324313).

1211310320111 is an equidigital number, since it uses as much as digits as its factorization.

1211310320111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9324312.

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 1211310320111 its reverse (1110230131121), we get a palindrome (2321540451232).

The spelling of 1211310320111 in words is "one trillion, two hundred eleven billion, three hundred ten million, three hundred twenty thousand, one hundred eleven".