21013312332 has 48 divisors (see below), whose sum is σ = 51941215872. Its totient is φ = 6589113600.

The previous prime is 21013312303. The next prime is 21013312339. The reversal of 21013312332 is 23321331012.

It is a junction number, because it is equal to n+sod(n) for n = 21013312299 and 21013312308.

It is not an unprimeable number, because it can be changed into a prime (21013312339) 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, 400207 + ... + 449657.

It is an arithmetic number, because the mean of its divisors is an integer number (1082108664).

Almost surely, 2^21013312332 is an apocalyptic number.

It is an amenable number.

21013312332 is an abundant number, since it is smaller than the sum of its proper divisors (30927903540).

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

21013312332 is a wasteful number, since it uses less digits than its factorization.

21013312332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51558 (or 51556 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21013312332 its reverse (23321331012), we get a palindrome (44334643344).

The spelling of 21013312332 in words is "twenty-one billion, thirteen million, three hundred twelve thousand, three hundred thirty-two".