21333143552 has 104 divisors (see below), whose sum is σ = 48891227136. Its totient is φ = 9117351936.

The previous prime is 21333143497. The next prime is 21333143561. The reversal of 21333143552 is 25534133312.

It is a super-3 number, since 3×21333143552³ (a number of 32 digits) contains 333 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13274333 + ... + 13275939.

Almost surely, 2^21333143552 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 21333143552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24445613568).

21333143552 is an abundant number, since it is smaller than the sum of its proper divisors (27558083584).

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

21333143552 is an equidigital number, since it uses as much as digits as its factorization.

21333143552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2101 (or 2079 counting only the distinct ones).

The product of its digits is 32400, while the sum is 32.

Adding to 21333143552 its reverse (25534133312), we get a palindrome (46867276864).

The spelling of 21333143552 in words is "twenty-one billion, three hundred thirty-three million, one hundred forty-three thousand, five hundred fifty-two".