123421077918 has 64 divisors (see below), whose sum is σ = 282531744000. Its totient is φ = 39913806240.

The previous prime is 123421077917. The next prime is 123421077973. The reversal of 123421077918 is 819770124321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123421077917) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 167613 + ... + 524343.

It is an arithmetic number, because the mean of its divisors is an integer number (4414558500).

Almost surely, 2^123421077918 is an apocalyptic number.

123421077918 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 123421077918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141265872000).

123421077918 is an abundant number, since it is smaller than the sum of its proper divisors (159110666082).

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

123421077918 is a wasteful number, since it uses less digits than its factorization.

123421077918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356934 (or 356928 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The spelling of 123421077918 in words is "one hundred twenty-three billion, four hundred twenty-one million, seventy-seven thousand, nine hundred eighteen".