2121334221 has 16 divisors (see below), whose sum is σ = 2868991488. Its totient is φ = 1394094000.

The previous prime is 2121334199. The next prime is 2121334223. The reversal of 2121334221 is 1224331212.

It is not a de Polignac number, because 2121334221 - 2⁶ = 2121334157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121334223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41470 + ... + 77216.

It is an arithmetic number, because the mean of its divisors is an integer number (179311968).

Almost surely, 2^2121334221 is an apocalyptic number.

It is an amenable number.

2121334221 is a deficient number, since it is larger than the sum of its proper divisors (747657267).

2121334221 is a wasteful number, since it uses less digits than its factorization.

2121334221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36032.

The product of its digits is 576, while the sum is 21.

The square root of 2121334221 is about 46057.9441681888. The cubic root of 2121334221 is about 1284.9010953062.

Adding to 2121334221 its reverse (1224331212), we get a palindrome (3345665433).

The spelling of 2121334221 in words is "two billion, one hundred twenty-one million, three hundred thirty-four thousand, two hundred twenty-one".