1211310323111 has 16 divisors (see below), whose sum is σ = 1418941440000. Its totient is φ = 1033610024664.

The previous prime is 1211310323101. The next prime is 1211310323159. The reversal of 1211310323111 is 1113230131121.

It is not a de Polignac number, because 1211310323111 - 2¹⁸ = 1211310060967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211310323101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7841711 + ... + 7994688.

It is an arithmetic number, because the mean of its divisors is an integer number (88683840000).

Almost surely, 2^{1211310323111} is an apocalyptic number.

1211310323111 is a deficient number, since it is larger than the sum of its proper divisors (207631116889).

1211310323111 is an equidigital number, since it uses as much as digits as its factorization.

1211310323111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15836643 (or 15836629 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 20.

Adding to 1211310323111 its reverse (1113230131121), we get a palindrome (2324540454232).

The spelling of 1211310323111 in words is "one trillion, two hundred eleven billion, three hundred ten million, three hundred twenty-three thousand, one hundred eleven".