2121021204 has 24 divisors (see below), whose sum is σ = 5042429280. Its totient is φ = 693667104.

The previous prime is 2121021197. The next prime is 2121021223. The reversal of 2121021204 is 4021201212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1666834 + ... + 1668105.

It is an arithmetic number, because the mean of its divisors is an integer number (210101220).

Almost surely, 2^2121021204 is an apocalyptic number.

It is an amenable number.

2121021204 is an abundant number, since it is smaller than the sum of its proper divisors (2921408076).

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

2121021204 is a wasteful number, since it uses less digits than its factorization.

2121021204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3334999 (or 3334997 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 2121021204 is about 46054.5459645408. The cubic root of 2121021204 is about 1284.8378936246.

Adding to 2121021204 its reverse (4021201212), we get a palindrome (6142222416).

The spelling of 2121021204 in words is "two billion, one hundred twenty-one million, twenty-one thousand, two hundred four".