21436525923584 has 144 divisors (see below), whose sum is σ = 46374934681152. Its totient is φ = 9849997000704.

The previous prime is 21436525923569. The next prime is 21436525923613. The reversal of 21436525923584 is 48532952563412.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 638678387 + ... + 638711949.

It is an arithmetic number, because the mean of its divisors is an integer number (322048157508).

Almost surely, 2^{21436525923584} 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 21436525923584, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23187467340576).

21436525923584 is an abundant number, since it is smaller than the sum of its proper divisors (24938408757568).

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

21436525923584 is a wasteful number, since it uses less digits than its factorization.

21436525923584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37052 (or 37038 counting only the distinct ones).

The product of its digits is 62208000, while the sum is 59.

The spelling of 21436525923584 in words is "twenty-one trillion, four hundred thirty-six billion, five hundred twenty-five million, nine hundred twenty-three thousand, five hundred eighty-four".