1103131021 has 2 divisors, whose sum is σ = 1103131022. Its totient is φ = 1103131020.

The previous prime is 1103130967. The next prime is 1103131067. The reversal of 1103131021 is 1201313011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1062042921 + 41088100 = 32589^2 + 6410^2 .

It is a cyclic number.

It is not a de Polignac number, because 1103131021 - 2¹³ = 1103122829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1103130992 and 1103131010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1103131091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 551565510 + 551565511.

It is an arithmetic number, because the mean of its divisors is an integer number (551565511).

Almost surely, 2^1103131021 is an apocalyptic number.

It is an amenable number.

1103131021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1103131021 is an equidigital number, since it uses as much as digits as its factorization.

1103131021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 1103131021 is about 33213.4162801721. The cubic root of 1103131021 is about 1033.2586090838.

Adding to 1103131021 its reverse (1201313011), we get a palindrome (2304444032).

The spelling of 1103131021 in words is "one billion, one hundred three million, one hundred thirty-one thousand, twenty-one".