21260063 has 8 divisors (see below), whose sum is σ = 23385936. Its totient is φ = 19326120.

The previous prime is 21260051. The next prime is 21260077. The reversal of 21260063 is 36006212.

It is not a de Polignac number, because 21260063 - 2⁸ = 21259807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21260003) 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 in 7 ways as a sum of consecutive naturals, for example, 6656 + ... + 9317.

It is an arithmetic number, because the mean of its divisors is an integer number (2923242).

Almost surely, 2^21260063 is an apocalyptic number.

21260063 is a deficient number, since it is larger than the sum of its proper divisors (2125873).

21260063 is an equidigital number, since it uses as much as digits as its factorization.

21260063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16006 (or 15984 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 21260063 is about 4610.8635850565. The cubic root of 21260063 is about 277.0266279623.

Adding to 21260063 its reverse (36006212), we get a palindrome (57266275).

The spelling of 21260063 in words is "twenty-one million, two hundred sixty thousand, sixty-three".