2161504338 has 128 divisors (see below), whose sum is σ = 5476294656. Its totient is φ = 554649600.

The previous prime is 2161504307. The next prime is 2161504351. The reversal of 2161504338 is 8334051612.

It is a junction number, because it is equal to n+sod(n) for n = 2161504299 and 2161504308.

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 63 ways as a sum of consecutive naturals, for example, 1375093 + ... + 1376663.

It is an arithmetic number, because the mean of its divisors is an integer number (42783552).

Almost surely, 2^2161504338 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2161504338, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2738147328).

2161504338 is an abundant number, since it is smaller than the sum of its proper divisors (3314790318).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2161504338 is a wasteful number, since it uses less digits than its factorization.

2161504338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1688.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 2161504338 is about 46491.9814376630. The cubic root of 2161504338 is about 1292.9608367842.

The spelling of 2161504338 in words is "two billion, one hundred sixty-one million, five hundred four thousand, three hundred thirty-eight".