18421771323450 has 192 divisors, whose sum is σ = 50906604625920. Its totient is φ = 4370270112000.

The previous prime is 18421771323433. The next prime is 18421771323479. The reversal of 18421771323450 is 5432317712481.

It is a self number, because there is not a number n which added to its sum of digits gives 18421771323450.

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 95 ways as a sum of consecutive naturals, for example, 874675920 + ... + 874696980.

It is an arithmetic number, because the mean of its divisors is an integer number (265138565760).

Almost surely, 2^{18421771323450} is an apocalyptic number.

18421771323450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18421771323450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25453302312960).

18421771323450 is an abundant number, since it is smaller than the sum of its proper divisors (32484833302470).

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

18421771323450 is a wasteful number, since it uses less digits than its factorization.

18421771323450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32413 (or 32408 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 48.

The spelling of 18421771323450 in words is "eighteen trillion, four hundred twenty-one billion, seven hundred seventy-one million, three hundred twenty-three thousand, four hundred fifty".