18712991220000 has 2160 divisors, whose sum is σ = 80462289400416. Its totient is φ = 3790617600000.

The previous prime is 18712991219789. The next prime is 18712991220029. The reversal of 18712991220000 is 2219921781.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 359 ways as a sum of consecutive naturals, for example, 14585339359 + ... + 14585340641.

Almost surely, 2^{18712991220000} is an apocalyptic number.

18712991220000 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 18712991220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40231144700208).

18712991220000 is an abundant number, since it is smaller than the sum of its proper divisors (61749298180416).

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

18712991220000 is a wasteful number, since it uses less digits than its factorization.

18712991220000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1393 (or 1352 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 42.

The spelling of 18712991220000 in words is "eighteen trillion, seven hundred twelve billion, nine hundred ninety-one million, two hundred twenty thousand".