21871849774976 has 128 divisors (see below), whose sum is σ = 46476657783360. Its totient is φ = 10216811888640.

The previous prime is 21871849774919. The next prime is 21871849775003. The reversal of 21871849774976 is 67947794817812.

It is a tau number, because it is divible by the number of its divisors (128).

It is a self number, because there is not a number n which added to its sum of digits gives 21871849774976.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 237492650 + ... + 237584726.

Almost surely, 2^{21871849774976} 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 21871849774976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23238328891680).

21871849774976 is an abundant number, since it is smaller than the sum of its proper divisors (24604808008384).

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

21871849774976 is a wasteful number, since it uses less digits than its factorization.

21871849774976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92912 (or 92900 counting only the distinct ones).

The product of its digits is 2389782528, while the sum is 80.

The spelling of 21871849774976 in words is "twenty-one trillion, eight hundred seventy-one billion, eight hundred forty-nine million, seven hundred seventy-four thousand, nine hundred seventy-six".