21532004232 has 32 divisors (see below), whose sum is σ = 53840479680. Its totient is φ = 7175938880.

The previous prime is 21532004213. The next prime is 21532004233. The reversal of 21532004232 is 23240023512.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (21532004233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42682 + ... + 211862.

It is an arithmetic number, because the mean of its divisors is an integer number (1682514990).

Almost surely, 2^21532004232 is an apocalyptic number.

It is an amenable number.

21532004232 is an abundant number, since it is smaller than the sum of its proper divisors (32308475448).

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

21532004232 is a wasteful number, since it uses less digits than its factorization.

21532004232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174493 (or 174489 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

Adding to 21532004232 its reverse (23240023512), we get a palindrome (44772027744).

The spelling of 21532004232 in words is "twenty-one billion, five hundred thirty-two million, four thousand, two hundred thirty-two".