123523410021 has 16 divisors (see below), whose sum is σ = 182715678720. Its totient is φ = 73593812720.

The previous prime is 123523410007. The next prime is 123523410037. The reversal of 123523410021 is 120014325321.

It is a cyclic number.

It is not a de Polignac number, because 123523410021 - 2¹⁰ = 123523408997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123523409973 and 123523410000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123523410121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31719525 + ... + 31723418.

It is an arithmetic number, because the mean of its divisors is an integer number (11419729920).

Almost surely, 2^123523410021 is an apocalyptic number.

123523410021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

123523410021 is a deficient number, since it is larger than the sum of its proper divisors (59192268699).

123523410021 is a wasteful number, since it uses less digits than its factorization.

123523410021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63443016.

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 123523410021 its reverse (120014325321), we get a palindrome (243537735342).

The spelling of 123523410021 in words is "one hundred twenty-three billion, five hundred twenty-three million, four hundred ten thousand, twenty-one".