1311212221103 has 4 divisors (see below), whose sum is σ = 1311256651848. Its totient is φ = 1311167790360.

The previous prime is 1311212221091. The next prime is 1311212221147. The reversal of 1311212221103 is 3011222121131.

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 1311212221103 - 2⁴⁰ = 211700593327 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 (1311212221603) 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, 22171076 + ... + 22230137.

It is an arithmetic number, because the mean of its divisors is an integer number (327814162962).

Almost surely, 2^{1311212221103} is an apocalyptic number.

1311212221103 is a deficient number, since it is larger than the sum of its proper divisors (44430745).

1311212221103 is an equidigital number, since it uses as much as digits as its factorization.

1311212221103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44430744.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 1311212221103 its reverse (3011222121131), we get a palindrome (4322434342234).

The spelling of 1311212221103 in words is "one trillion, three hundred eleven billion, two hundred twelve million, two hundred twenty-one thousand, one hundred three".