21838877255844 has 384 divisors, whose sum is σ = 64664588943360. Its totient is φ = 6309277286400.

The previous prime is 21838877255831. The next prime is 21838877255851. The reversal of 21838877255844 is 44855277883812.

21838877255844 is a `hidden beast` number, since 2 + 1 + 8 + 38 + 8 + 7 + 7 + 2 + 5 + 584 + 4 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 17944845124 + ... + 17944846340.

It is an arithmetic number, because the mean of its divisors is an integer number (168397367040).

Almost surely, 2^{21838877255844} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21838877255844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32332294471680).

21838877255844 is an abundant number, since it is smaller than the sum of its proper divisors (42825711687516).

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

21838877255844 is a wasteful number, since it uses less digits than its factorization.

21838877255844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2888 (or 2880 counting only the distinct ones).

The product of its digits is 963379200, while the sum is 72.

The spelling of 21838877255844 in words is "twenty-one trillion, eight hundred thirty-eight billion, eight hundred seventy-seven million, two hundred fifty-five thousand, eight hundred forty-four".