2021323221 has 8 divisors (see below), whose sum is σ = 2994552960. Its totient is φ = 1347548796.

The previous prime is 2021323217. The next prime is 2021323223. The reversal of 2021323221 is 1223231202.

It is not a de Polignac number, because 2021323221 - 2² = 2021323217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2021323194 and 2021323203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021323223) 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, 37431885 + ... + 37431938.

It is an arithmetic number, because the mean of its divisors is an integer number (374319120).

Almost surely, 2^2021323221 is an apocalyptic number.

It is an amenable number.

2021323221 is a deficient number, since it is larger than the sum of its proper divisors (973229739).

2021323221 is an equidigital number, since it uses as much as digits as its factorization.

2021323221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74863832 (or 74863826 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 2021323221 is about 44959.1283389703. The cubic root of 2021323221 is about 1264.3828265208.

Adding to 2021323221 its reverse (1223231202), we get a palindrome (3244554423).

It can be divided in two parts, 20213 and 23221, that added together give a palindrome (43434).

The spelling of 2021323221 in words is "two billion, twenty-one million, three hundred twenty-three thousand, two hundred twenty-one".