21145063 has 2 divisors, whose sum is σ = 21145064. Its totient is φ = 21145062.

The previous prime is 21145051. The next prime is 21145067. The reversal of 21145063 is 36054112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21145063 - 2⁹ = 21144551 is a prime.

It is a super-2 number, since 2×21145063² = 894227378547938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21145067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10572531 + 10572532.

It is an arithmetic number, because the mean of its divisors is an integer number (10572532).

Almost surely, 2^21145063 is an apocalyptic number.

21145063 is a deficient number, since it is larger than the sum of its proper divisors (1).

21145063 is an equidigital number, since it uses as much as digits as its factorization.

21145063 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 22.

The square root of 21145063 is about 4598.3761264168. The cubic root of 21145063 is about 276.5262268471.

Adding to 21145063 its reverse (36054112), we get a palindrome (57199175).

The spelling of 21145063 in words is "twenty-one million, one hundred forty-five thousand, sixty-three".