1312221232111 has 4 divisors (see below), whose sum is σ = 1312265291752. Its totient is φ = 1312177172472.

The previous prime is 1312221232103. The next prime is 1312221232123. The reversal of 1312221232111 is 1112321222131.

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 1312221232111 - 2³ = 1312221232103 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 (1312221232171) 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, 21985116 + ... + 22044721.

It is an arithmetic number, because the mean of its divisors is an integer number (328066322938).

Almost surely, 2^{1312221232111} is an apocalyptic number.

1312221232111 is a deficient number, since it is larger than the sum of its proper divisors (44059641).

1312221232111 is an equidigital number, since it uses as much as digits as its factorization.

1312221232111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44059640.

The product of its digits is 288, while the sum is 22.

Adding to 1312221232111 its reverse (1112321222131), we get a palindrome (2424542454242).

The spelling of 1312221232111 in words is "one trillion, three hundred twelve billion, two hundred twenty-one million, two hundred thirty-two thousand, one hundred eleven".