21608463 has 8 divisors (see below), whose sum is σ = 28840576. Its totient is φ = 14391000.

The previous prime is 21608459. The next prime is 21608467. The reversal of 21608463 is 36480612.

It is an interprime number because it is at equal distance from previous prime (21608459) and next prime (21608467).

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

It is not a de Polignac number, because 21608463 - 2² = 21608459 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21608463.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21608467) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 438 + ... + 6588.

It is an arithmetic number, because the mean of its divisors is an integer number (3605072).

Almost surely, 2^21608463 is an apocalyptic number.

21608463 is a deficient number, since it is larger than the sum of its proper divisors (7232113).

21608463 is a wasteful number, since it uses less digits than its factorization.

21608463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7325.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 21608463 is about 4648.4904001192. The cubic root of 21608463 is about 278.5316972734.

The spelling of 21608463 in words is "twenty-one million, six hundred eight thousand, four hundred sixty-three".