2021121321 has 8 divisors (see below), whose sum is σ = 2695248864. Its totient is φ = 1347204000.

The previous prime is 2021121293. The next prime is 2021121329. The reversal of 2021121321 is 1231211202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2021121321 - 2¹⁸ = 2020859177 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2021121321.

It is not an unprimeable number, because it can be changed into a prime (2021121329) 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 7 ways as a sum of consecutive naturals, for example, 28555 + ... + 69696.

It is an arithmetic number, because the mean of its divisors is an integer number (336906108).

Almost surely, 2^2021121321 is an apocalyptic number.

It is an amenable number.

2021121321 is a deficient number, since it is larger than the sum of its proper divisors (674127543).

2021121321 is an equidigital number, since it uses as much as digits as its factorization.

2021121321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105111.

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

The square root of 2021121321 is about 44956.8829101841. The cubic root of 2021121321 is about 1264.3407274658.

Adding to 2021121321 its reverse (1231211202), we get a palindrome (3252332523).

The spelling of 2021121321 in words is "two billion, twenty-one million, one hundred twenty-one thousand, three hundred twenty-one".