21346305663 has 16 divisors (see below), whose sum is σ = 30150269280. Its totient is φ = 13387401216.

The previous prime is 21346305653. The next prime is 21346305691. The reversal of 21346305663 is 36650364312.

It is not a de Polignac number, because 21346305663 - 2⁴ = 21346305647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21346305613) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10281 + ... + 206877.

It is an arithmetic number, because the mean of its divisors is an integer number (1884391830).

Almost surely, 2^21346305663 is an apocalyptic number.

21346305663 is a deficient number, since it is larger than the sum of its proper divisors (8803963617).

21346305663 is a wasteful number, since it uses less digits than its factorization.

21346305663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198746.

The product of its (nonzero) digits is 233280, while the sum is 39.

Adding to 21346305663 its reverse (36650364312), we get a palindrome (57996669975).

It can be divided in two parts, 213 and 46305663, that added together give a triangular number (46305876 = T₉₆₂₃).

The spelling of 21346305663 in words is "twenty-one billion, three hundred forty-six million, three hundred five thousand, six hundred sixty-three".