21133134 has 72 divisors (see below), whose sum is σ = 52118976. Its totient is φ = 6177600.

The previous prime is 21133121. The next prime is 21133153. The reversal of 21133134 is 43133112.

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 67362 + ... + 67674.

Almost surely, 2^21133134 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21133134, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26059488).

21133134 is an abundant number, since it is smaller than the sum of its proper divisors (30985842).

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

21133134 is a wasteful number, since it uses less digits than its factorization.

21133134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374 (or 360 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 21133134 is about 4597.0788550992. The cubic root of 21133134 is about 276.4742162529.

Adding to 21133134 its reverse (43133112), we get a palindrome (64266246).

The spelling of 21133134 in words is "twenty-one million, one hundred thirty-three thousand, one hundred thirty-four".