21331211232 has 96 divisors (see below), whose sum is σ = 60974121600. Its totient is φ = 6503874048.

The previous prime is 21331211183. The next prime is 21331211233. The reversal of 21331211232 is 23211213312.

It is a tau number, because it is divible by the number of its divisors (96).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21331211199 and 21331211208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331211233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148738 + ... + 254529.

It is an arithmetic number, because the mean of its divisors is an integer number (635147100).

Almost surely, 2^21331211232 is an apocalyptic number.

It is an amenable number.

21331211232 is an abundant number, since it is smaller than the sum of its proper divisors (39642910368).

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

21331211232 is a wasteful number, since it uses less digits than its factorization.

21331211232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403328 (or 403320 counting only the distinct ones).

The product of its digits is 432, while the sum is 21.

Adding to 21331211232 its reverse (23211213312), we get a palindrome (44542424544).

The spelling of 21331211232 in words is "twenty-one billion, three hundred thirty-one million, two hundred eleven thousand, two hundred thirty-two".