2243221021 has 4 divisors (see below), whose sum is σ = 2320573500. Its totient is φ = 2165868544.

The previous prime is 2243221007. The next prime is 2243221061. The reversal of 2243221021 is 1201223422.

2243221021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 478296900 + 1764924121 = 21870^2 + 42011^2 .

It is a cyclic number.

It is not a de Polignac number, because 2243221021 - 2⁵ = 2243220989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2243221021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2243221061) 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, 38676196 + ... + 38676253.

It is an arithmetic number, because the mean of its divisors is an integer number (580143375).

Almost surely, 2^2243221021 is an apocalyptic number.

It is an amenable number.

2243221021 is a deficient number, since it is larger than the sum of its proper divisors (77352479).

2243221021 is an equidigital number, since it uses as much as digits as its factorization.

2243221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77352478.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 2243221021 is about 47362.6542858400. The cubic root of 2243221021 is about 1309.0533768804.

Adding to 2243221021 its reverse (1201223422), we get a palindrome (3444444443).

The spelling of 2243221021 in words is "two billion, two hundred forty-three million, two hundred twenty-one thousand, twenty-one".