21313532 has 12 divisors (see below), whose sum is σ = 37476936. Its totient is φ = 10605840.

The previous prime is 21313531. The next prime is 21313541. The reversal of 21313532 is 23531312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21313531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11783 + ... + 13470.

It is an arithmetic number, because the mean of its divisors is an integer number (3123078).

Almost surely, 2^21313532 is an apocalyptic number.

It is an amenable number.

21313532 is a deficient number, since it is larger than the sum of its proper divisors (16163404).

21313532 is a wasteful number, since it uses less digits than its factorization.

21313532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25468 (or 25466 counting only the distinct ones).

The product of its digits is 540, while the sum is 20.

The square root of 21313532 is about 4616.6580986683. The cubic root of 21313532 is about 277.2586739418.

Adding to 21313532 its reverse (23531312), we get a palindrome (44844844).

The spelling of 21313532 in words is "twenty-one million, three hundred thirteen thousand, five hundred thirty-two".