21013320332 has 24 divisors (see below), whose sum is σ = 38795022000. Its totient is φ = 9931493376.

The previous prime is 21013320323. The next prime is 21013320359. The reversal of 21013320332 is 23302331012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 273773 + ... + 342020.

It is an arithmetic number, because the mean of its divisors is an integer number (1616459250).

Almost surely, 2^21013320332 is an apocalyptic number.

It is an amenable number.

21013320332 is a deficient number, since it is larger than the sum of its proper divisors (17781701668).

21013320332 is a wasteful number, since it uses less digits than its factorization.

21013320332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616265 (or 616263 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21013320332 its reverse (23302331012), we get a palindrome (44315651344).

The spelling of 21013320332 in words is "twenty-one billion, thirteen million, three hundred twenty thousand, three hundred thirty-two".