21818465236848 has 240 divisors, whose sum is σ = 66232287183744. Its totient is φ = 6170660052480.

The previous prime is 21818465236847. The next prime is 21818465236861. The reversal of 21818465236848 is 84863256481812.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21818465236847) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 321340983 + ... + 321408873.

Almost surely, 2^{21818465236848} is an apocalyptic number.

21818465236848 is a gapful number since it is divisible by the number (28) 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 21818465236848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33116143591872).

21818465236848 is an abundant number, since it is smaller than the sum of its proper divisors (44413821946896).

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

21818465236848 is a wasteful number, since it uses less digits than its factorization.

21818465236848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69300 (or 69287 counting only the distinct ones).

The product of its digits is 141557760, while the sum is 66.

The spelling of 21818465236848 in words is "twenty-one trillion, eight hundred eighteen billion, four hundred sixty-five million, two hundred thirty-six thousand, eight hundred forty-eight".