123123021021 has 96 divisors (see below), whose sum is σ = 249166374912. Its totient is φ = 56472958080.

The previous prime is 123123021013. The next prime is 123123021037. The reversal of 123123021021 is 120120321321.

It is not a de Polignac number, because 123123021021 - 2³ = 123123021013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123123020985 and 123123021003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123123021421) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 89895 + ... + 504308.

It is an arithmetic number, because the mean of its divisors is an integer number (2595483072).

Almost surely, 2^123123021021 is an apocalyptic number.

123123021021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

123123021021 is an abundant number, since it is smaller than the sum of its proper divisors (126043353891).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123123021021 is a wasteful number, since it uses less digits than its factorization.

123123021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594263 (or 594260 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 123123021021 its reverse (120120321321), we get a palindrome (243243342342).

The spelling of 123123021021 in words is "one hundred twenty-three billion, one hundred twenty-three million, twenty-one thousand, twenty-one".