1321021103 has 16 divisors (see below), whose sum is σ = 1365619200. Its totient is φ = 1277138016.

The previous prime is 1321021069. The next prime is 1321021129. The reversal of 1321021103 is 3011201231.

It is a cyclic number.

It is not a de Polignac number, because 1321021103 - 2¹⁶ = 1320955567 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 (1321021133) 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, 2712326 + ... + 2712812.

It is an arithmetic number, because the mean of its divisors is an integer number (85351200).

Almost surely, 2^1321021103 is an apocalyptic number.

1321021103 is a deficient number, since it is larger than the sum of its proper divisors (44598097).

1321021103 is a wasteful number, since it uses less digits than its factorization.

1321021103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1046.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1321021103 is about 36345.8540001470. The cubic root of 1321021103 is about 1097.2440937653.

Adding to 1321021103 its reverse (3011201231), we get a palindrome (4332222334).

The spelling of 1321021103 in words is "one billion, three hundred twenty-one million, twenty-one thousand, one hundred three".