2161312233 has 4 divisors (see below), whose sum is σ = 2881749648. Its totient is φ = 1440874820.

The previous prime is 2161312229. The next prime is 2161312267. The reversal of 2161312233 is 3322131612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2161312233 - 2² = 2161312229 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2161312333) 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, 360218703 + ... + 360218708.

It is an arithmetic number, because the mean of its divisors is an integer number (720437412).

Almost surely, 2^2161312233 is an apocalyptic number.

It is an amenable number.

2161312233 is a deficient number, since it is larger than the sum of its proper divisors (720437415).

2161312233 is an equidigital number, since it uses as much as digits as its factorization.

2161312233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720437414.

The product of its digits is 1296, while the sum is 24.

The square root of 2161312233 is about 46489.9153903295. The cubic root of 2161312233 is about 1292.9225314250.

Adding to 2161312233 its reverse (3322131612), we get a palindrome (5483443845).

The spelling of 2161312233 in words is "two billion, one hundred sixty-one million, three hundred twelve thousand, two hundred thirty-three".