21303110663 has 2 divisors, whose sum is σ = 21303110664. Its totient is φ = 21303110662.

The previous prime is 21303110603. The next prime is 21303110687. The reversal of 21303110663 is 36601130312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21303110663 - 2²⁴ = 21286333447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21303110603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10651555331 + 10651555332.

It is an arithmetic number, because the mean of its divisors is an integer number (10651555332).

Almost surely, 2^21303110663 is an apocalyptic number.

21303110663 is a deficient number, since it is larger than the sum of its proper divisors (1).

21303110663 is an equidigital number, since it uses as much as digits as its factorization.

21303110663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 26.

Adding to 21303110663 its reverse (36601130312), we get a palindrome (57904240975).

The spelling of 21303110663 in words is "twenty-one billion, three hundred three million, one hundred ten thousand, six hundred sixty-three".