21353063 has 2 divisors, whose sum is σ = 21353064. Its totient is φ = 21353062.

The previous prime is 21353053. The next prime is 21353081. The reversal of 21353063 is 36035312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21353063 - 2⁴ = 21353047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21353053) 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, 10676531 + 10676532.

It is an arithmetic number, because the mean of its divisors is an integer number (10676532).

Almost surely, 2^21353063 is an apocalyptic number.

21353063 is a deficient number, since it is larger than the sum of its proper divisors (1).

21353063 is an equidigital number, since it uses as much as digits as its factorization.

21353063 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 23.

The square root of 21353063 is about 4620.9374590011. The cubic root of 21353063 is about 277.4299820642.

Adding to 21353063 its reverse (36035312), we get a palindrome (57388375).

The spelling of 21353063 in words is "twenty-one million, three hundred fifty-three thousand, sixty-three".