21260563416646 has 8 divisors (see below), whose sum is σ = 32033853399744. Its totient is φ = 10582612283400.

The previous prime is 21260563416581. The next prime is 21260563416661. The reversal of 21260563416646 is 64661436506212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21260563416593 and 21260563416602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23834711905 + ... + 23834712796.

It is an arithmetic number, because the mean of its divisors is an integer number (4004231674968).

Almost surely, 2^{21260563416646} is an apocalyptic number.

21260563416646 is a deficient number, since it is larger than the sum of its proper divisors (10773289983098).

21260563416646 is a wasteful number, since it uses less digits than its factorization.

21260563416646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47669424926.

The product of its (nonzero) digits is 7464960, while the sum is 52.

The spelling of 21260563416646 in words is "twenty-one trillion, two hundred sixty billion, five hundred sixty-three million, four hundred sixteen thousand, six hundred forty-six".