2161224605 has 8 divisors (see below), whose sum is σ = 2594931552. Its totient is φ = 1728005008.

The previous prime is 2161224599. The next prime is 2161224629. The reversal of 2161224605 is 5064221612.

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 2161224605 - 2¹⁶ = 2161159069 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

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, 112007 + ... + 129876.

It is an arithmetic number, because the mean of its divisors is an integer number (324366444).

Almost surely, 2^2161224605 is an apocalyptic number.

It is an amenable number.

2161224605 is a deficient number, since it is larger than the sum of its proper divisors (433706947).

2161224605 is a wasteful number, since it uses less digits than its factorization.

2161224605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243675.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 2161224605 is about 46488.9729398274. The cubic root of 2161224605 is about 1292.9050578203.

The spelling of 2161224605 in words is "two billion, one hundred sixty-one million, two hundred twenty-four thousand, six hundred five".