18721426494912 has 224 divisors, whose sum is σ = 50952102190080. Its totient is φ = 6063815208960.

The previous prime is 18721426494877. The next prime is 18721426494941. The reversal of 18721426494912 is 21949462412781.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1011030678 + ... + 1011049194.

It is an arithmetic number, because the mean of its divisors is an integer number (227464741920).

Almost surely, 2^{18721426494912} is an apocalyptic number.

18721426494912 is a gapful number since it is divisible by the number (12) 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 18721426494912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25476051095040).

18721426494912 is an abundant number, since it is smaller than the sum of its proper divisors (32230675695168).

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

18721426494912 is a wasteful number, since it uses less digits than its factorization.

18721426494912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19379 (or 19369 counting only the distinct ones).

The product of its digits is 13934592, while the sum is 60.

The spelling of 18721426494912 in words is "eighteen trillion, seven hundred twenty-one billion, four hundred twenty-six million, four hundred ninety-four thousand, nine hundred twelve".