21324201026432 has 128 divisors (see below), whose sum is σ = 43190616268800. Its totient is φ = 10485786880000.

The previous prime is 21324201026431. The next prime is 21324201026459. The reversal of 21324201026432 is 23462010242312.

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

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21324201026431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1775383307 + ... + 1775395317.

It is an arithmetic number, because the mean of its divisors is an integer number (337426689600).

Almost surely, 2^{21324201026432} 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 21324201026432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21595308134400).

21324201026432 is an abundant number, since it is smaller than the sum of its proper divisors (21866415242368).

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

21324201026432 is a wasteful number, since it uses less digits than its factorization.

21324201026432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13036 (or 13024 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 32.

Adding to 21324201026432 its reverse (23462010242312), we get a palindrome (44786211268744).

The spelling of 21324201026432 in words is "twenty-one trillion, three hundred twenty-four billion, two hundred one million, twenty-six thousand, four hundred thirty-two".