21432333552 has 80 divisors (see below), whose sum is σ = 63423654912. Its totient is φ = 6109274880.

The previous prime is 21432333529. The next prime is 21432333557. The reversal of 21432333552 is 25533323412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21432333557) 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, 70818 + ... + 218814.

Almost surely, 2^21432333552 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 21432333552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31711827456).

21432333552 is an abundant number, since it is smaller than the sum of its proper divisors (41991321360).

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

21432333552 is a wasteful number, since it uses less digits than its factorization.

21432333552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148446 (or 148440 counting only the distinct ones).

The product of its digits is 64800, while the sum is 33.

Adding to 21432333552 its reverse (25533323412), we get a palindrome (46965656964).

The spelling of 21432333552 in words is "twenty-one billion, four hundred thirty-two million, three hundred thirty-three thousand, five hundred fifty-two".