1312221211111 has 16 divisors (see below), whose sum is σ = 1390175539200. Its totient is φ = 1235171440800.

The previous prime is 1312221211061. The next prime is 1312221211121. The reversal of 1312221211111 is 1111121222131.

It is not a de Polignac number, because 1312221211111 - 2¹⁷ = 1312221080039 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312221211121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2829241 + ... + 3260221.

It is an arithmetic number, because the mean of its divisors is an integer number (86885971200).

Almost surely, 2^{1312221211111} is an apocalyptic number.

1312221211111 is a deficient number, since it is larger than the sum of its proper divisors (77954328089).

1312221211111 is a wasteful number, since it uses less digits than its factorization.

1312221211111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432030.

The product of its digits is 48, while the sum is 19.

Adding to 1312221211111 its reverse (1111121222131), we get a palindrome (2423342433242).

The spelling of 1312221211111 in words is "one trillion, three hundred twelve billion, two hundred twenty-one million, two hundred eleven thousand, one hundred eleven".