21303732 has 24 divisors (see below), whose sum is σ = 49829472. Its totient is φ = 7084000.

The previous prime is 21303713. The next prime is 21303757. The reversal of 21303732 is 23730312.

It is a junction number, because it is equal to n+sod(n) for n = 21303699 and 21303708.

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, 3607 + ... + 7457.

It is an arithmetic number, because the mean of its divisors is an integer number (2076228).

Almost surely, 2^21303732 is an apocalyptic number.

It is an amenable number.

21303732 is an abundant number, since it is smaller than the sum of its proper divisors (28525740).

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

21303732 is a wasteful number, since it uses less digits than its factorization.

21303732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4319 (or 4317 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 21.

The square root of 21303732 is about 4615.5966028240. The cubic root of 21303732 is about 277.2161727496.

The spelling of 21303732 in words is "twenty-one million, three hundred three thousand, seven hundred thirty-two".