21010133 has 4 divisors (see below), whose sum is σ = 21027840. Its totient is φ = 20992428.

The previous prime is 21010127. The next prime is 21010153. The reversal of 21010133 is 33101012.

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 21010133 - 2⁶ = 21010069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010153) 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, 6935 + ... + 9492.

It is an arithmetic number, because the mean of its divisors is an integer number (5256960).

Almost surely, 2^21010133 is an apocalyptic number.

It is an amenable number.

21010133 is a deficient number, since it is larger than the sum of its proper divisors (17707).

21010133 is a wasteful number, since it uses less digits than its factorization.

21010133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17706.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 21010133 is about 4583.6811625592. The cubic root of 21010133 is about 275.9367853895.

Adding to 21010133 its reverse (33101012), we get a palindrome (54111145).

The spelling of 21010133 in words is "twenty-one million, ten thousand, one hundred thirty-three".