21039133 has 2 divisors, whose sum is σ = 21039134. Its totient is φ = 21039132.

The previous prime is 21039119. The next prime is 21039143. The reversal of 21039133 is 33193012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17455684 + 3583449 = 4178^2 + 1893^2 .

It is a cyclic number.

It is not a de Polignac number, because 21039133 - 2⁵ = 21039101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21039103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10519566 + 10519567.

It is an arithmetic number, because the mean of its divisors is an integer number (10519567).

Almost surely, 2^21039133 is an apocalyptic number.

It is an amenable number.

21039133 is a deficient number, since it is larger than the sum of its proper divisors (1).

21039133 is an equidigital number, since it uses as much as digits as its factorization.

21039133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486, while the sum is 22.

The square root of 21039133 is about 4586.8434680072. The cubic root of 21039133 is about 276.0636842822.

It can be divided in two parts, 2103 and 9133, that added together give a square (11236 = 106²).

The spelling of 21039133 in words is "twenty-one million, thirty-nine thousand, one hundred thirty-three".