21524330232 has 80 divisors (see below), whose sum is σ = 60501602040. Its totient is φ = 7149363264.

The previous prime is 21524330221. The next prime is 21524330239. The reversal of 21524330232 is 23203342512.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21524330196 and 21524330205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21524330239) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 124698 + ... + 242070.

Almost surely, 2^21524330232 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 21524330232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30250801020).

21524330232 is an abundant number, since it is smaller than the sum of its proper divisors (38977271808).

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

21524330232 is a wasteful number, since it uses less digits than its factorization.

21524330232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117674 (or 117661 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 27.

Adding to 21524330232 its reverse (23203342512), we get a palindrome (44727672744).

The spelling of 21524330232 in words is "twenty-one billion, five hundred twenty-four million, three hundred thirty thousand, two hundred thirty-two".