21608601 has 8 divisors (see below), whose sum is σ = 32927424. Its totient is φ = 12347760.

The previous prime is 21608551. The next prime is 21608603. The reversal of 21608601 is 10680612.

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

It is not a de Polignac number, because 21608601 - 2⁶ = 21608537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21608603) 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, 514470 + ... + 514511.

It is an arithmetic number, because the mean of its divisors is an integer number (4115928).

Almost surely, 2^21608601 is an apocalyptic number.

21608601 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21608601 is a deficient number, since it is larger than the sum of its proper divisors (11318823).

21608601 is a wasteful number, since it uses less digits than its factorization.

21608601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1028991.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 21608601 is about 4648.5052436240. The cubic root of 21608601 is about 278.5322902092.

The spelling of 21608601 in words is "twenty-one million, six hundred eight thousand, six hundred one".