1311221103 has 8 divisors (see below), whose sum is σ = 1840310400. Its totient is φ = 828139608.

The previous prime is 1311221077. The next prime is 1311221111. The reversal of 1311221103 is 3011221131.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1311221103 - 2⁶ = 1311221039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311221143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11501883 + ... + 11501996.

It is an arithmetic number, because the mean of its divisors is an integer number (230038800).

Almost surely, 2^1311221103 is an apocalyptic number.

1311221103 is a deficient number, since it is larger than the sum of its proper divisors (529089297).

1311221103 is a wasteful number, since it uses less digits than its factorization.

1311221103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23003901.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1311221103 is about 36210.7871082637. The cubic root of 1311221103 is about 1094.5240532856.

Adding to 1311221103 its reverse (3011221131), we get a palindrome (4322442234).

The spelling of 1311221103 in words is "one billion, three hundred eleven million, two hundred twenty-one thousand, one hundred three".