2121803516 has 12 divisors (see below), whose sum is σ = 4243607088. Its totient is φ = 909344352.

The previous prime is 2121803513. The next prime is 2121803533. The reversal of 2121803516 is 6153081212.

2121803516 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121803513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37889321 + ... + 37889376.

It is an arithmetic number, because the mean of its divisors is an integer number (353633924).

Almost surely, 2^2121803516 is an apocalyptic number.

It is an amenable number.

2121803516 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2121803516 is a wasteful number, since it uses less digits than its factorization.

2121803516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75778708 (or 75778706 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 2121803516 is about 46063.0385016013. The cubic root of 2121803516 is about 1284.9958396409.

Adding to 2121803516 its reverse (6153081212), we get a palindrome (8274884728).

The spelling of 2121803516 in words is "two billion, one hundred twenty-one million, eight hundred three thousand, five hundred sixteen".