21544302332 has 12 divisors (see below), whose sum is σ = 43088604720. Its totient is φ = 9233272416.

The previous prime is 21544302259. The next prime is 21544302389. The reversal of 21544302332 is 23320344512.

It is a happy number.

21544302332 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21544302295 and 21544302304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 384719657 + ... + 384719712.

It is an arithmetic number, because the mean of its divisors is an integer number (3590717060).

Almost surely, 2^21544302332 is an apocalyptic number.

It is an amenable number.

21544302332 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21544302332 is a wasteful number, since it uses less digits than its factorization.

21544302332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769439380 (or 769439378 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 29.

Adding to 21544302332 its reverse (23320344512), we get a palindrome (44864646844).

The spelling of 21544302332 in words is "twenty-one billion, five hundred forty-four million, three hundred two thousand, three hundred thirty-two".