1123131021 has 32 divisors (see below), whose sum is σ = 1609420800. Its totient is φ = 694552320.

The previous prime is 1123131019. The next prime is 1123131029. The reversal of 1123131021 is 1201313211.

It is a happy number.

1123131021 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1123131021 - 2¹ = 1123131019 is a prime.

It is a super-2 number, since 2×1123131021² = 2522846580665004882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123131029) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1132836 + ... + 1133826.

It is an arithmetic number, because the mean of its divisors is an integer number (50294400).

Almost surely, 2^1123131021 is an apocalyptic number.

It is an amenable number.

1123131021 is a deficient number, since it is larger than the sum of its proper divisors (486289779).

1123131021 is a wasteful number, since it uses less digits than its factorization.

1123131021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1409.

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

The square root of 1123131021 is about 33513.1469874138. The cubic root of 1123131021 is about 1039.4656466618.

Adding to 1123131021 its reverse (1201313211), we get a palindrome (2324444232).

The spelling of 1123131021 in words is "one billion, one hundred twenty-three million, one hundred thirty-one thousand, twenty-one".