2161121050 has 24 divisors (see below), whose sum is σ = 4385112192. Its totient is φ = 785862000.

The previous prime is 2161121033. The next prime is 2161121059. The reversal of 2161121050 is 501211612.

It is not an unprimeable number, because it can be changed into a prime (2161121059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1964106 + ... + 1965205.

It is an arithmetic number, because the mean of its divisors is an integer number (182713008).

Almost surely, 2^2161121050 is an apocalyptic number.

2161121050 is an abundant number, since it is smaller than the sum of its proper divisors (2223991142).

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

2161121050 is a wasteful number, since it uses less digits than its factorization.

2161121050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3929334 (or 3929329 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 19.

The square root of 2161121050 is about 46487.8591677440. The cubic root of 2161121050 is about 1292.8844076572.

Adding to 2161121050 its reverse (501211612), we get a palindrome (2662332662).

The spelling of 2161121050 in words is "two billion, one hundred sixty-one million, one hundred twenty-one thousand, fifty".