123421077920 has 96 divisors (see below), whose sum is σ = 333389903616. Its totient is φ = 42296371200.

The previous prime is 123421077917. The next prime is 123421077973. The reversal of 123421077920 is 29770124321.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2530565 + ... + 2578875.

It is an arithmetic number, because the mean of its divisors is an integer number (3472811496).

Almost surely, 2^123421077920 is an apocalyptic number.

123421077920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123421077920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (166694951808).

123421077920 is an abundant number, since it is smaller than the sum of its proper divisors (209968825696).

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

123421077920 is a wasteful number, since it uses less digits than its factorization.

123421077920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50614 (or 50606 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 38.

The spelling of 123421077920 in words is "one hundred twenty-three billion, four hundred twenty-one million, seventy-seven thousand, nine hundred twenty".