2120816420 has 24 divisors (see below), whose sum is σ = 4454923200. Its totient is φ = 848096352.

The previous prime is 2120816417. The next prime is 2120816437. The reversal of 2120816420 is 246180212.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 2120816420.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74561 + ... + 98999.

It is an arithmetic number, because the mean of its divisors is an integer number (185621800).

Almost surely, 2^2120816420 is an apocalyptic number.

2120816420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2120816420 is an abundant number, since it is smaller than the sum of its proper divisors (2334106780).

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

2120816420 is a wasteful number, since it uses less digits than its factorization.

2120816420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28787 (or 28785 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 2120816420 is about 46052.3226341517. The cubic root of 2120816420 is about 1284.7965420481.

Adding to 2120816420 its reverse (246180212), we get a palindrome (2366996632).

The spelling of 2120816420 in words is "two billion, one hundred twenty million, eight hundred sixteen thousand, four hundred twenty".