21033211232 has 72 divisors (see below), whose sum is σ = 46626319656. Its totient is φ = 9327296000.

The previous prime is 21033211219. The next prime is 21033211237. The reversal of 21033211232 is 23211233012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033211237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 92507 + ... + 224997.

It is an arithmetic number, because the mean of its divisors is an integer number (647587773).

Almost surely, 2^21033211232 is an apocalyptic number.

21033211232 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21033211232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23313159828).

21033211232 is an abundant number, since it is smaller than the sum of its proper divisors (25593108424).

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

21033211232 is a wasteful number, since it uses less digits than its factorization.

21033211232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132564 (or 132545 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21033211232 its reverse (23211233012), we get a palindrome (44244444244).

The spelling of 21033211232 in words is "twenty-one billion, thirty-three million, two hundred eleven thousand, two hundred thirty-two".