1321100103 has 4 divisors (see below), whose sum is σ = 1761466808. Its totient is φ = 880733400.

The previous prime is 1321100087. The next prime is 1321100113. The reversal of 1321100103 is 3010011231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3010011231 = 3 ⋅1003337077.

It is not a de Polignac number, because 1321100103 - 2⁴ = 1321100087 is a prime.

It is a super-2 number, since 2×1321100103² = 3490610964293221218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321100113) 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, 220183348 + ... + 220183353.

It is an arithmetic number, because the mean of its divisors is an integer number (440366702).

Almost surely, 2^1321100103 is an apocalyptic number.

1321100103 is a deficient number, since it is larger than the sum of its proper divisors (440366705).

1321100103 is an equidigital number, since it uses as much as digits as its factorization.

1321100103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440366704.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 1321100103 is about 36346.9407653519. The cubic root of 1321100103 is about 1097.2659658750.

Adding to 1321100103 its reverse (3010011231), we get a palindrome (4331111334).

The spelling of 1321100103 in words is "one billion, three hundred twenty-one million, one hundred thousand, one hundred three".