2161161020 has 24 divisors (see below), whose sum is σ = 4539737664. Its totient is φ = 864216896.

The previous prime is 2161161017. The next prime is 2161161053. The reversal of 2161161020 is 201611612.

2161161020 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 2161160983 and 2161161001.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 66797 + ... + 93723.

It is an arithmetic number, because the mean of its divisors is an integer number (189155736).

Almost surely, 2^2161161020 is an apocalyptic number.

2161161020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2161161020 is an abundant number, since it is smaller than the sum of its proper divisors (2378576644).

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

2161161020 is a wasteful number, since it uses less digits than its factorization.

2161161020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30949 (or 30947 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 2161161020 is about 46488.2890629457. The cubic root of 2161161020 is about 1292.8923782537.

Adding to 2161161020 its reverse (201611612), we get a palindrome (2362772632).

The spelling of 2161161020 in words is "two billion, one hundred sixty-one million, one hundred sixty-one thousand, twenty".