21133042 has 16 divisors (see below), whose sum is σ = 36312192. Its totient is φ = 9036000.

The previous prime is 21133027. The next prime is 21133087. The reversal of 21133042 is 24033112.

It is a happy 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 7 ways as a sum of consecutive naturals, for example, 5542 + ... + 8542.

It is an arithmetic number, because the mean of its divisors is an integer number (2269512).

Almost surely, 2^21133042 is an apocalyptic number.

21133042 is a deficient number, since it is larger than the sum of its proper divisors (15179150).

21133042 is a wasteful number, since it uses less digits than its factorization.

21133042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3513.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 21133042 is about 4597.0688487339. The cubic root of 21133042 is about 276.4738150557.

Adding to 21133042 its reverse (24033112), we get a palindrome (45166154).

The spelling of 21133042 in words is "twenty-one million, one hundred thirty-three thousand, forty-two".