21152740745584 has 160 divisors (see below), whose sum is σ = 50023952547840. Its totient is φ = 8469217612800.

The previous prime is 21152740745569. The next prime is 21152740745597. The reversal of 21152740745584 is 48554704725112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 928432657 + ... + 928455439.

It is an arithmetic number, because the mean of its divisors is an integer number (312649703424).

Almost surely, 2^{21152740745584} 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 21152740745584, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25011976273920).

21152740745584 is an abundant number, since it is smaller than the sum of its proper divisors (28871211802256).

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

21152740745584 is a wasteful number, since it uses less digits than its factorization.

21152740745584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32079 (or 32073 counting only the distinct ones).

The product of its (nonzero) digits is 12544000, while the sum is 55.

The spelling of 21152740745584 in words is "twenty-one trillion, one hundred fifty-two billion, seven hundred forty million, seven hundred forty-five thousand, five hundred eighty-four".