2121304664 has 16 divisors (see below), whose sum is σ = 4031932920. Its totient is φ = 1046122560.

The previous prime is 2121304649. The next prime is 2121304667. The reversal of 2121304664 is 4664031212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121304667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1815602 + ... + 1816769.

Almost surely, 2^2121304664 is an apocalyptic number.

It is an amenable number.

2121304664 is a deficient number, since it is larger than the sum of its proper divisors (1910628256).

2121304664 is a wasteful number, since it uses less digits than its factorization.

2121304664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3632450 (or 3632446 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 2121304664 is about 46057.6232995147. The cubic root of 2121304664 is about 1284.8951276786.

Adding to 2121304664 its reverse (4664031212), we get a palindrome (6785335876).

The spelling of 2121304664 in words is "two billion, one hundred twenty-one million, three hundred four thousand, six hundred sixty-four".