1211231232311 has 4 divisors (see below), whose sum is σ = 1211259312624. Its totient is φ = 1211203152000.

The previous prime is 1211231232283. The next prime is 1211231232317. The reversal of 1211231232311 is 1132321321121.

It is a happy number.

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 1211231232311 - 2¹⁴ = 1211231215927 is a prime.

It is a super-3 number, since 3×1211231232311³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211231232317) 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, 13975355 + ... + 14061756.

It is an arithmetic number, because the mean of its divisors is an integer number (302814828156).

Almost surely, 2^{1211231232311} is an apocalyptic number.

1211231232311 is a deficient number, since it is larger than the sum of its proper divisors (28080313).

1211231232311 is an equidigital number, since it uses as much as digits as its factorization.

1211231232311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28080312.

The product of its digits is 432, while the sum is 23.

Adding to 1211231232311 its reverse (1132321321121), we get a palindrome (2343552553432).

The spelling of 1211231232311 in words is "one trillion, two hundred eleven billion, two hundred thirty-one million, two hundred thirty-two thousand, three hundred eleven".