21013332 has 24 divisors (see below), whose sum is σ = 49106400. Its totient is φ = 6993696.

The previous prime is 21013303. The next prime is 21013357. The reversal of 21013332 is 23331012.

It is a congruent number.

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, 12519 + ... + 14097.

It is an arithmetic number, because the mean of its divisors is an integer number (2046100).

Almost surely, 2^21013332 is an apocalyptic number.

It is an amenable number.

21013332 is an abundant number, since it is smaller than the sum of its proper divisors (28093068).

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

21013332 is a wasteful number, since it uses less digits than its factorization.

21013332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2695 (or 2693 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 21013332 is about 4584.0301046132. The cubic root of 21013332 is about 275.9507893779.

Adding to 21013332 its reverse (23331012), we get a palindrome (44344344).

The spelling of 21013332 in words is "twenty-one million, thirteen thousand, three hundred thirty-two".