21161105 has 8 divisors (see below), whose sum is σ = 29020992. Its totient is φ = 14510448.

The previous prime is 21161089. The next prime is 21161113. The reversal of 21161105 is 50116112.

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

It is a cyclic number.

It is not a de Polignac number, because 21161105 - 2⁴ = 21161089 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, 302267 + ... + 302336.

It is an arithmetic number, because the mean of its divisors is an integer number (3627624).

Almost surely, 2^21161105 is an apocalyptic number.

It is an amenable number.

21161105 is a deficient number, since it is larger than the sum of its proper divisors (7859887).

21161105 is an equidigital number, since it uses as much as digits as its factorization.

21161105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604615.

The product of its (nonzero) digits is 60, while the sum is 17.

The square root of 21161105 is about 4600.1201071276. The cubic root of 21161105 is about 276.5961393429.

Adding to 21161105 its reverse (50116112), we get a palindrome (71277217).

It can be divided in two parts, 211 and 61105, that added together give a palindrome (61316).

The spelling of 21161105 in words is "twenty-one million, one hundred sixty-one thousand, one hundred five".