1103203121 has 2 divisors, whose sum is σ = 1103203122. Its totient is φ = 1103203120.

The previous prime is 1103203111. The next prime is 1103203133. The reversal of 1103203121 is 1213023011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 919302400 + 183900721 = 30320^2 + 13561^2 .

It is a cyclic number.

It is not a de Polignac number, because 1103203121 - 2¹⁴ = 1103186737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1103203096 and 1103203105.

It is not a weakly prime, because it can be changed into another prime (1103203111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 551601560 + 551601561.

It is an arithmetic number, because the mean of its divisors is an integer number (551601561).

Almost surely, 2^1103203121 is an apocalyptic number.

It is an amenable number.

1103203121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1103203121 is an equidigital number, since it uses as much as digits as its factorization.

1103203121 is an evil number, because the sum of its binary digits is even.

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

The square root of 1103203121 is about 33214.5016671935. The cubic root of 1103203121 is about 1033.2811196533.

Adding to 1103203121 its reverse (1213023011), we get a palindrome (2316226132).

The spelling of 1103203121 in words is "one billion, one hundred three million, two hundred three thousand, one hundred twenty-one".