21133104 has 40 divisors (see below), whose sum is σ = 54780720. Its totient is φ = 7020288.

The previous prime is 21133093. The next prime is 21133109. The reversal of 21133104 is 40133112.

21133104 = T₁₀₇ + T₁₀₈ + ... + T₅₀₃.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21133109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18502 + ... + 19610.

It is an arithmetic number, because the mean of its divisors is an integer number (1369518).

Almost surely, 2^21133104 is an apocalyptic number.

21133104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21133104 is an abundant number, since it is smaller than the sum of its proper divisors (33647616).

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

21133104 is a wasteful number, since it uses less digits than its factorization.

21133104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1517 (or 1511 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 21133104 is about 4597.0755921564. The cubic root of 21133104 is about 276.4740854279.

Adding to 21133104 its reverse (40133112), we get a palindrome (61266216).

The spelling of 21133104 in words is "twenty-one million, one hundred thirty-three thousand, one hundred four".