21159133 has 2 divisors, whose sum is σ = 21159134. Its totient is φ = 21159132.

The previous prime is 21159121. The next prime is 21159161. The reversal of 21159133 is 33195112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20448484 + 710649 = 4522^2 + 843^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21159133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21159098 and 21159107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21159163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10579566 + 10579567.

It is an arithmetic number, because the mean of its divisors is an integer number (10579567).

Almost surely, 2^21159133 is an apocalyptic number.

It is an amenable number.

21159133 is a deficient number, since it is larger than the sum of its proper divisors (1).

21159133 is an equidigital number, since it uses as much as digits as its factorization.

21159133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 810, while the sum is 25.

The square root of 21159133 is about 4599.9057599042. The cubic root of 21159133 is about 276.5875470926.

The spelling of 21159133 in words is "twenty-one million, one hundred fifty-nine thousand, one hundred thirty-three".