21333331232 has 24 divisors (see below), whose sum is σ = 43024388652. Its totient is φ = 10406502400.

The previous prime is 21333331231. The next prime is 21333331237. The reversal of 21333331232 is 23213333312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21279807376 + 53523856 = 145876^2 + 7316^2 .

It is a super-2 number, since 2×21333331232² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21333331231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8128769 + ... + 8131392.

Almost surely, 2^21333331232 is an apocalyptic number.

It is an amenable number.

21333331232 is an abundant number, since it is smaller than the sum of its proper divisors (21691057420).

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

21333331232 is a wasteful number, since it uses less digits than its factorization.

21333331232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16260212 (or 16260204 counting only the distinct ones).

The product of its digits is 5832, while the sum is 26.

Adding to 21333331232 its reverse (23213333312), we get a palindrome (44546664544).

The spelling of 21333331232 in words is "twenty-one billion, three hundred thirty-three million, three hundred thirty-one thousand, two hundred thirty-two".