21043153 has 2 divisors, whose sum is σ = 21043154. Its totient is φ = 21043152.

The previous prime is 21043133. The next prime is 21043171. The reversal of 21043153 is 35134012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14010049 + 7033104 = 3743^2 + 2652^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21043153 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21043153.

It is not a weakly prime, because it can be changed into another prime (21043123) 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 as a sum of consecutive naturals, namely, 10521576 + 10521577.

It is an arithmetic number, because the mean of its divisors is an integer number (10521577).

Almost surely, 2^21043153 is an apocalyptic number.

It is an amenable number.

21043153 is a deficient number, since it is larger than the sum of its proper divisors (1).

21043153 is an equidigital number, since it uses as much as digits as its factorization.

21043153 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 21043153 is about 4587.2816569293. The cubic root of 21043153 is about 276.0812658897.

Adding to 21043153 its reverse (35134012), we get a palindrome (56177165).

The spelling of 21043153 in words is "twenty-one million, forty-three thousand, one hundred fifty-three".