2021321121 has 16 divisors (see below), whose sum is σ = 2813377536. Its totient is φ = 1288452176.

The previous prime is 2021321119. The next prime is 2021321123. The reversal of 2021321121 is 1211231202.

It is an interprime number because it is at equal distance from previous prime (2021321119) and next prime (2021321123).

It is a cyclic number.

It is not a de Polignac number, because 2021321121 - 2¹ = 2021321119 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2021321121.

It is not an unprimeable number, because it can be changed into a prime (2021321123) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 258556 + ... + 266258.

It is an arithmetic number, because the mean of its divisors is an integer number (175836096).

Almost surely, 2^2021321121 is an apocalyptic number.

It is an amenable number.

2021321121 is a deficient number, since it is larger than the sum of its proper divisors (792056415).

2021321121 is a wasteful number, since it uses less digits than its factorization.

2021321121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11532.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 2021321121 is about 44959.1049844189. The cubic root of 2021321121 is about 1264.3823886550.

Adding to 2021321121 its reverse (1211231202), we get a palindrome (3232552323).

The spelling of 2021321121 in words is "two billion, twenty-one million, three hundred twenty-one thousand, one hundred twenty-one".