1312220311111 has 4 divisors (see below), whose sum is σ = 1312241562832. Its totient is φ = 1312199059392.

The previous prime is 1312220311109. The next prime is 1312220311121. The reversal of 1312220311111 is 1111130222131.

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 1312220311111 - 2¹ = 1312220311109 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 (1312220311121) 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, 10532970 + ... + 10656823.

It is an arithmetic number, because the mean of its divisors is an integer number (328060390708).

Almost surely, 2^{1312220311111} is an apocalyptic number.

1312220311111 is a deficient number, since it is larger than the sum of its proper divisors (21251721).

1312220311111 is an equidigital number, since it uses as much as digits as its factorization.

1312220311111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21251720.

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

Adding to 1312220311111 its reverse (1111130222131), we get a palindrome (2423350533242).

The spelling of 1312220311111 in words is "one trillion, three hundred twelve billion, two hundred twenty million, three hundred eleven thousand, one hundred eleven".