21040332 has 24 divisors (see below), whose sum is σ = 49207872. Its totient is φ = 6997200.

The previous prime is 21040297. The next prime is 21040387. The reversal of 21040332 is 23304012.

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, 4107 + ... + 7677.

It is an arithmetic number, because the mean of its divisors is an integer number (2050328).

Almost surely, 2^21040332 is an apocalyptic number.

It is an amenable number.

21040332 is an abundant number, since it is smaller than the sum of its proper divisors (28167540).

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

21040332 is a wasteful number, since it uses less digits than its factorization.

21040332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4069 (or 4067 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 21040332 is about 4586.9741660489. The cubic root of 21040332 is about 276.0689283840.

Adding to 21040332 its reverse (23304012), we get a palindrome (44344344).

The spelling of 21040332 in words is "twenty-one million, forty thousand, three hundred thirty-two".