21038153 has 2 divisors, whose sum is σ = 21038154. Its totient is φ = 21038152.

The previous prime is 21038141. The next prime is 21038179. The reversal of 21038153 is 35183012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19114384 + 1923769 = 4372^2 + 1387^2 .

It is a cyclic number.

It is not a de Polignac number, because 21038153 - 2⁸ = 21037897 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21038183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10519076 + 10519077.

It is an arithmetic number, because the mean of its divisors is an integer number (10519077).

Almost surely, 2^21038153 is an apocalyptic number.

It is an amenable number.

21038153 is a deficient number, since it is larger than the sum of its proper divisors (1).

21038153 is an equidigital number, since it uses as much as digits as its factorization.

21038153 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 21038153 is about 4586.7366394856. The cubic root of 21038153 is about 276.0593978791.

The spelling of 21038153 in words is "twenty-one million, thirty-eight thousand, one hundred fifty-three".