21606346463 has 4 divisors (see below), whose sum is σ = 23268373128. Its totient is φ = 19944319800.

The previous prime is 21606346457. The next prime is 21606346481. The reversal of 21606346463 is 36464360612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21606346463 - 2²⁰ = 21605297887 is a prime.

It is a super-2 number, since 2×21606346463² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21606346463.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21606343463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 831013313 + ... + 831013338.

It is an arithmetic number, because the mean of its divisors is an integer number (5817093282).

Almost surely, 2^21606346463 is an apocalyptic number.

21606346463 is a deficient number, since it is larger than the sum of its proper divisors (1662026665).

21606346463 is a wasteful number, since it uses less digits than its factorization.

21606346463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1662026664.

The product of its (nonzero) digits is 373248, while the sum is 41.

The spelling of 21606346463 in words is "twenty-one billion, six hundred six million, three hundred forty-six thousand, four hundred sixty-three".