2161222505 has 32 divisors (see below), whose sum is σ = 2888632320. Its totient is φ = 1541514240.

The previous prime is 2161222447. The next prime is 2161222523. The reversal of 2161222505 is 5052221612.

It is not a de Polignac number, because 2161222505 - 2⁸ = 2161222249 is a prime.

It is a super-2 number, since 2×2161222505² = 9341765432236950050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2032604 + ... + 2033666.

It is an arithmetic number, because the mean of its divisors is an integer number (90269760).

Almost surely, 2^2161222505 is an apocalyptic number.

It is an amenable number.

2161222505 is a deficient number, since it is larger than the sum of its proper divisors (727409815).

2161222505 is a wasteful number, since it uses less digits than its factorization.

2161222505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2121.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 2161222505 is about 46488.9503538206. The cubic root of 2161222505 is about 1292.9046390606.

The spelling of 2161222505 in words is "two billion, one hundred sixty-one million, two hundred twenty-two thousand, five hundred five".