1123020121 has 4 divisors (see below), whose sum is σ = 1149136912. Its totient is φ = 1096903332.

The previous prime is 1123020113. The next prime is 1123020139. The reversal of 1123020121 is 1210203211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1210203211 = 7 ⋅172886173.

It is a cyclic number.

It is not a de Polignac number, because 1123020121 - 2³ = 1123020113 is a prime.

It is a super-2 number, since 2×1123020121² = 2522348384341709282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1123020191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13058331 + ... + 13058416.

It is an arithmetic number, because the mean of its divisors is an integer number (287284228).

Almost surely, 2^1123020121 is an apocalyptic number.

It is an amenable number.

1123020121 is a deficient number, since it is larger than the sum of its proper divisors (26116791).

1123020121 is an equidigital number, since it uses as much as digits as its factorization.

1123020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26116790.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1123020121 is about 33511.4923720207. The cubic root of 1123020121 is about 1039.4314326260.

Adding to 1123020121 its reverse (1210203211), we get a palindrome (2333223332).

The spelling of 1123020121 in words is "one billion, one hundred twenty-three million, twenty thousand, one hundred twenty-one".