2121043420 has 48 divisors (see below), whose sum is σ = 4773087648. Its totient is φ = 788879360.

The previous prime is 2121043409. The next prime is 2121043423. The reversal of 2121043420 is 243401212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121043423) 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 15 ways as a sum of consecutive naturals, for example, 9361 + ... + 65800.

It is an arithmetic number, because the mean of its divisors is an integer number (99439326).

Almost surely, 2^2121043420 is an apocalyptic number.

2121043420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121043420 is an abundant number, since it is smaller than the sum of its proper divisors (2652044228).

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

2121043420 is a wasteful number, since it uses less digits than its factorization.

2121043420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75270 (or 75268 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 2121043420 is about 46054.7871561687. The cubic root of 2121043420 is about 1284.8423794919.

Adding to 2121043420 its reverse (243401212), we get a palindrome (2364444632).

The spelling of 2121043420 in words is "two billion, one hundred twenty-one million, forty-three thousand, four hundred twenty".