2161011223 has 4 divisors (see below), whose sum is σ = 2469727120. Its totient is φ = 1852295328.

The previous prime is 2161011221. The next prime is 2161011257. The reversal of 2161011223 is 3221101612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2161011223 - 2¹ = 2161011221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2161011223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161011221) 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, 154357938 + ... + 154357951.

It is an arithmetic number, because the mean of its divisors is an integer number (617431780).

Almost surely, 2^2161011223 is an apocalyptic number.

2161011223 is a deficient number, since it is larger than the sum of its proper divisors (308715897).

2161011223 is an equidigital number, since it uses as much as digits as its factorization.

2161011223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308715896.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 2161011223 is about 46486.6779088375. The cubic root of 2161011223 is about 1292.8625060580.

Adding to 2161011223 its reverse (3221101612), we get a palindrome (5382112835).

The spelling of 2161011223 in words is "two billion, one hundred sixty-one million, eleven thousand, two hundred twenty-three".