21443053 has 2 divisors, whose sum is σ = 21443054. Its totient is φ = 21443052.

The previous prime is 21443047. The next prime is 21443083. The reversal of 21443053 is 35034412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15697444 + 5745609 = 3962^2 + 2397^2 .

It is a cyclic number.

It is not a de Polignac number, because 21443053 - 2¹⁷ = 21311981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21443003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10721526 + 10721527.

It is an arithmetic number, because the mean of its divisors is an integer number (10721527).

Almost surely, 2^21443053 is an apocalyptic number.

It is an amenable number.

21443053 is a deficient number, since it is larger than the sum of its proper divisors (1).

21443053 is an equidigital number, since it uses as much as digits as its factorization.

21443053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 21443053 is about 4630.6644231687. The cubic root of 21443053 is about 277.8191679775.

Adding to 21443053 its reverse (35034412), we get a palindrome (56477465).

The spelling of 21443053 in words is "twenty-one million, four hundred forty-three thousand, fifty-three".