2161242120 has 64 divisors (see below), whose sum is σ = 6489616320. Its totient is φ = 575807744.

The previous prime is 2161242119. The next prime is 2161242133. The reversal of 2161242120 is 212421612.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134854 + ... + 150026.

It is an arithmetic number, because the mean of its divisors is an integer number (101400255).

Almost surely, 2^2161242120 is an apocalyptic number.

2161242120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2161242120 is an abundant number, since it is smaller than the sum of its proper divisors (4328374200).

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

2161242120 is a wasteful number, since it uses less digits than its factorization.

2161242120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16374 (or 16370 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 2161242120 is about 46489.1613174512. The cubic root of 2161242120 is about 1292.9085504653.

Adding to 2161242120 its reverse (212421612), we get a palindrome (2373663732).

The spelling of 2161242120 in words is "two billion, one hundred sixty-one million, two hundred forty-two thousand, one hundred twenty".