123102240400020 has 192 divisors, whose sum is σ = 425228729425920. Its totient is φ = 25986200013312.

The previous prime is 123102240399917. The next prime is 123102240400021. The reversal of 123102240400020 is 20004042201321.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 123102240400020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123102240400021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 219435432 + ... + 219995711.

It is an arithmetic number, because the mean of its divisors is an integer number (2214732965760).

Almost surely, 2^{123102240400020} is an apocalyptic number.

123102240400020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123102240400020 is an abundant number, since it is smaller than the sum of its proper divisors (302126489025900).

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

123102240400020 is a wasteful number, since it uses less digits than its factorization.

123102240400020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439431214 (or 439431212 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 123102240400020 its reverse (20004042201321), we get a palindrome (143106282601341).

The spelling of 123102240400020 in words is "one hundred twenty-three trillion, one hundred two billion, two hundred forty million, four hundred thousand, twenty".