21502254144032 has 96 divisors (see below), whose sum is σ = 44756901604800. Its totient is φ = 10140429312000.

The previous prime is 21502254144017. The next prime is 21502254144097. The reversal of 21502254144032 is 23044145220512.

It is a junction number, because it is equal to n+sod(n) for n = 21502254143983 and 21502254144001.

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, 652179644 + ... + 652212612.

It is an arithmetic number, because the mean of its divisors is an integer number (466217725050).

Almost surely, 2^{21502254144032} 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 21502254144032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22378450802400).

21502254144032 is an abundant number, since it is smaller than the sum of its proper divisors (23254647460768).

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

21502254144032 is a wasteful number, since it uses less digits than its factorization.

21502254144032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37690 (or 37682 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 35.

Adding to 21502254144032 its reverse (23044145220512), we get a palindrome (44546399364544).

The spelling of 21502254144032 in words is "twenty-one trillion, five hundred two billion, two hundred fifty-four million, one hundred forty-four thousand, thirty-two".