21022133 has 4 divisors (see below), whose sum is σ = 22933248. Its totient is φ = 19111020.

The previous prime is 21022117. The next prime is 21022163. The reversal of 21022133 is 33122012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21022133 - 2⁴ = 21022117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022103) 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 3 ways as a sum of consecutive naturals, for example, 955541 + ... + 955562.

It is an arithmetic number, because the mean of its divisors is an integer number (5733312).

Almost surely, 2^21022133 is an apocalyptic number.

It is an amenable number.

21022133 is a deficient number, since it is larger than the sum of its proper divisors (1911115).

21022133 is a wasteful number, since it uses less digits than its factorization.

21022133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1911114.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21022133 is about 4584.9899672736. The cubic root of 21022133 is about 275.9893094298.

Adding to 21022133 its reverse (33122012), we get a palindrome (54144145).

The spelling of 21022133 in words is "twenty-one million, twenty-two thousand, one hundred thirty-three".