1123121013 has 12 divisors (see below), whose sum is σ = 1741983840. Its totient is φ = 641783352.

The previous prime is 1123121011. The next prime is 1123121063. The reversal of 1123121013 is 3101213211.

It is a happy number.

It is not a de Polignac number, because 1123121013 - 2¹ = 1123121011 is a prime.

It is a super-2 number, since 2×1123121013² = 2522801619684292338, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1123120983 and 1123121001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123121011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3819993 + ... + 3820286.

It is an arithmetic number, because the mean of its divisors is an integer number (145165320).

Almost surely, 2^1123121013 is an apocalyptic number.

It is an amenable number.

1123121013 is a deficient number, since it is larger than the sum of its proper divisors (618862827).

1123121013 is an equidigital number, since it uses as much as digits as its factorization.

1123121013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7640296 (or 7640289 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1123121013 is about 33512.9976725449. The cubic root of 1123121013 is about 1039.4625591612.

Adding to 1123121013 its reverse (3101213211), we get a palindrome (4224334224).

The spelling of 1123121013 in words is "one billion, one hundred twenty-three million, one hundred twenty-one thousand, thirteen".