21132336 has 40 divisors (see below), whose sum is σ = 55415104. Its totient is φ = 6937920.

The previous prime is 21132317. The next prime is 21132341. The reversal of 21132336 is 63323112.

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

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, 70 + ... + 6501.

Almost surely, 2^21132336 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21132336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27707552).

21132336 is an abundant number, since it is smaller than the sum of its proper divisors (34282768).

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

21132336 is a wasteful number, since it uses less digits than its factorization.

21132336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6649 (or 6643 counting only the distinct ones).

The product of its digits is 648, while the sum is 21.

The square root of 21132336 is about 4596.9920600323. The cubic root of 21132336 is about 276.4707362642.

Adding to 21132336 its reverse (63323112), we get a palindrome (84455448).

The spelling of 21132336 in words is "twenty-one million, one hundred thirty-two thousand, three hundred thirty-six".