1321103212103 has 4 divisors (see below), whose sum is σ = 1356808704360. Its totient is φ = 1285397719848.

The previous prime is 1321103212097. The next prime is 1321103212111. The reversal of 1321103212103 is 3012123011231.

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 1321103212103 - 2⁴ = 1321103212087 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 (1321103212183) 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, 17852746073 + ... + 17852746146.

It is an arithmetic number, because the mean of its divisors is an integer number (339202176090).

Almost surely, 2^{1321103212103} is an apocalyptic number.

1321103212103 is a deficient number, since it is larger than the sum of its proper divisors (35705492257).

1321103212103 is an equidigital number, since it uses as much as digits as its factorization.

1321103212103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35705492256.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 1321103212103 its reverse (3012123011231), we get a palindrome (4333226223334).

The spelling of 1321103212103 in words is "one trillion, three hundred twenty-one billion, one hundred three million, two hundred twelve thousand, one hundred three".