21601105 has 8 divisors (see below), whose sum is σ = 25992000. Its totient is φ = 17233776.

The previous prime is 21601061. The next prime is 21601121. The reversal of 21601105 is 50110612.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21601105 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3805 + ... + 7594.

It is an arithmetic number, because the mean of its divisors is an integer number (3249000).

Almost surely, 2^21601105 is an apocalyptic number.

It is an amenable number.

21601105 is a deficient number, since it is larger than the sum of its proper divisors (4390895).

21601105 is a wasteful number, since it uses less digits than its factorization.

21601105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11783.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 21601105 is about 4647.6988930007. The cubic root of 21601105 is about 278.5000789688.

Adding to 21601105 its reverse (50110612), we get a palindrome (71711717).

The spelling of 21601105 in words is "twenty-one million, six hundred one thousand, one hundred five".