1212312310111 has 4 divisors (see below), whose sum is σ = 1385499782992. Its totient is φ = 1039124837232.

The previous prime is 1212312310087. The next prime is 1212312310123. The reversal of 1212312310111 is 1110132132121.

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 1212312310111 - 2⁹ = 1212312309599 is a prime.

It is a super-2 number, since 2×1212312310111² (a number of 25 digits) contains 22 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 (1212312310211) 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, 86593736430 + ... + 86593736443.

It is an arithmetic number, because the mean of its divisors is an integer number (346374945748).

Almost surely, 2^{1212312310111} is an apocalyptic number.

1212312310111 is a deficient number, since it is larger than the sum of its proper divisors (173187472881).

1212312310111 is an equidigital number, since it uses as much as digits as its factorization.

1212312310111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173187472880.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 1212312310111 its reverse (1110132132121), we get a palindrome (2322444442232).

It can be divided in two parts, 121231 and 2310111, that added together give a palindrome (2431342).

The spelling of 1212312310111 in words is "one trillion, two hundred twelve billion, three hundred twelve million, three hundred ten thousand, one hundred eleven".