2161242105 has 48 divisors (see below), whose sum is σ = 3849296640. Its totient is φ = 1034542080.

The previous prime is 2161242103. The next prime is 2161242119. The reversal of 2161242105 is 5012421612.

It is not a de Polignac number, because 2161242105 - 2¹ = 2161242103 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2161242103) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 135849 + ... + 150921.

It is an arithmetic number, because the mean of its divisors is an integer number (80193680).

Almost surely, 2^2161242105 is an apocalyptic number.

It is an amenable number.

2161242105 is a deficient number, since it is larger than the sum of its proper divisors (1688054535).

2161242105 is a wasteful number, since it uses less digits than its factorization.

2161242105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15182 (or 15171 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 2161242105 is about 46489.1611561233. The cubic root of 2161242105 is about 1292.9085474742.

Adding to 2161242105 its reverse (5012421612), we get a palindrome (7173663717).

The spelling of 2161242105 in words is "two billion, one hundred sixty-one million, two hundred forty-two thousand, one hundred five".