21332436 has 12 divisors (see below), whose sum is σ = 49775712. Its totient is φ = 7110808.

The previous prime is 21332419. The next prime is 21332471. The reversal of 21332436 is 63423312.

It is a tau number, because it is divible by the number of its divisors (12).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 888840 + ... + 888863.

It is an arithmetic number, because the mean of its divisors is an integer number (4147976).

Almost surely, 2^21332436 is an apocalyptic number.

It is an amenable number.

21332436 is an abundant number, since it is smaller than the sum of its proper divisors (28443276).

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

21332436 is a wasteful number, since it uses less digits than its factorization.

21332436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1777710 (or 1777708 counting only the distinct ones).

The product of its digits is 2592, while the sum is 24.

The square root of 21332436 is about 4618.7050133127. The cubic root of 21332436 is about 277.3406210846.

Adding to 21332436 its reverse (63423312), we get a palindrome (84755748).

The spelling of 21332436 in words is "twenty-one million, three hundred thirty-two thousand, four hundred thirty-six".