21133368 has 48 divisors (see below), whose sum is σ = 58640400. Its totient is φ = 6871680.

The previous prime is 21133309. The next prime is 21133381. The reversal of 21133368 is 86333112.

It is a happy number.

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 11 ways as a sum of consecutive naturals, for example, 628 + ... + 6531.

It is an arithmetic number, because the mean of its divisors is an integer number (1221675).

Almost surely, 2^21133368 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 21133368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29320200).

21133368 is an abundant number, since it is smaller than the sum of its proper divisors (37507032).

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

21133368 is a wasteful number, since it uses less digits than its factorization.

21133368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7212 (or 7205 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 21133368 is about 4597.1043059735. The cubic root of 21133368 is about 276.4752366841.

The spelling of 21133368 in words is "twenty-one million, one hundred thirty-three thousand, three hundred sixty-eight".