12218726426400 has 1008 divisors, whose sum is σ = 48843726926400. Its totient is φ = 2965194086400.

The previous prime is 12218726426381. The next prime is 12218726426407. The reversal of 12218726426400 is 462462781221.

12218726426400 is a `hidden beast` number, since 1 + 2 + 2 + 187 + 2 + 6 + 426 + 40 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (12218726426407) by changing a digit.

It is a polite number, since it can be written in 167 ways as a sum of consecutive naturals, for example, 538282251 + ... + 538304949.

It is an arithmetic number, because the mean of its divisors is an integer number (48456078300).

Almost surely, 2^{12218726426400} is an apocalyptic number.

12218726426400 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 12218726426400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24421863463200).

12218726426400 is an abundant number, since it is smaller than the sum of its proper divisors (36625000500000).

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

12218726426400 is a wasteful number, since it uses less digits than its factorization.

12218726426400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22821 (or 22793 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 45.

The spelling of 12218726426400 in words is "twelve trillion, two hundred eighteen billion, seven hundred twenty-six million, four hundred twenty-six thousand, four hundred".