1231220234311 has 4 divisors (see below), whose sum is σ = 1248086264992. Its totient is φ = 1214354203632.

The previous prime is 1231220234273. The next prime is 1231220234317. The reversal of 1231220234311 is 1134320221321.

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 1231220234311 - 2¹⁵ = 1231220201543 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 (1231220234317) 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, 8433015231 + ... + 8433015376.

It is an arithmetic number, because the mean of its divisors is an integer number (312021566248).

Almost surely, 2^{1231220234311} is an apocalyptic number.

1231220234311 is a deficient number, since it is larger than the sum of its proper divisors (16866030681).

1231220234311 is an equidigital number, since it uses as much as digits as its factorization.

1231220234311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16866030680.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 1231220234311 its reverse (1134320221321), we get a palindrome (2365540455632).

The spelling of 1231220234311 in words is "one trillion, two hundred thirty-one billion, two hundred twenty million, two hundred thirty-four thousand, three hundred eleven".