123113203021 has 4 divisors (see below), whose sum is σ = 123506536252. Its totient is φ = 122719869792.

The previous prime is 123113202991. The next prime is 123113203039. The reversal of 123113203021 is 120302311321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24902418025 + 98210784996 = 157805^2 + 313386^2 .

It is a cyclic number.

It is not a de Polignac number, because 123113203021 - 2³³ = 114523268429 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123113203021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123113203621) 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, 196666146 + ... + 196666771.

It is an arithmetic number, because the mean of its divisors is an integer number (30876634063).

Almost surely, 2^123113203021 is an apocalyptic number.

It is an amenable number.

123113203021 is a deficient number, since it is larger than the sum of its proper divisors (393333231).

123113203021 is an equidigital number, since it uses as much as digits as its factorization.

123113203021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393333230.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 123113203021 its reverse (120302311321), we get a palindrome (243415514342).

The spelling of 123113203021 in words is "one hundred twenty-three billion, one hundred thirteen million, two hundred three thousand, twenty-one".