2161252112 has 20 divisors (see below), whose sum is σ = 4188148236. Its totient is φ = 1080439680.

The previous prime is 2161252097. The next prime is 2161252117. The reversal of 2161252112 is 2112521612.

It can be written as a sum of positive squares in 2 ways, for example, as 382437136 + 1778814976 = 19556^2 + 42176^2 .

It is not an unprimeable number, because it can be changed into a prime (2161252117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167558 + ... + 179994.

Almost surely, 2^2161252112 is an apocalyptic number.

It is an amenable number.

2161252112 is a deficient number, since it is larger than the sum of its proper divisors (2026896124).

2161252112 is a wasteful number, since it uses less digits than its factorization.

2161252112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23306 (or 23300 counting only the distinct ones).

The product of its digits is 480, while the sum is 23.

The square root of 2161252112 is about 46489.2687832364. The cubic root of 2161252112 is about 1292.9105429495.

Adding to 2161252112 its reverse (2112521612), we get a palindrome (4273773724).

The spelling of 2161252112 in words is "two billion, one hundred sixty-one million, two hundred fifty-two thousand, one hundred twelve".