21136133 has 2 divisors, whose sum is σ = 21136134. Its totient is φ = 21136132.

The previous prime is 21136127. The next prime is 21136147. The reversal of 21136133 is 33163112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13557124 + 7579009 = 3682^2 + 2753^2 .

It is a cyclic number.

It is not a de Polignac number, because 21136133 - 2⁶ = 21136069 is a prime.

It is a super-2 number, since 2×21136133² = 893472236387378, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21136123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10568066 + 10568067.

It is an arithmetic number, because the mean of its divisors is an integer number (10568067).

Almost surely, 2^21136133 is an apocalyptic number.

It is an amenable number.

21136133 is a deficient number, since it is larger than the sum of its proper divisors (1).

21136133 is an equidigital number, since it uses as much as digits as its factorization.

21136133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324, while the sum is 20.

The square root of 21136133 is about 4597.4050289266. The cubic root of 21136133 is about 276.4872937730.

Adding to 21136133 its reverse (33163112), we get a palindrome (54299245).

The spelling of 21136133 in words is "twenty-one million, one hundred thirty-six thousand, one hundred thirty-three".