2231305021 has 4 divisors (see below), whose sum is σ = 2434150944. Its totient is φ = 2028459100.

The previous prime is 2231304991. The next prime is 2231305057. The reversal of 2231305021 is 1205031322.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2231305021 - 2¹¹ = 2231302973 is a prime.

It is a super-3 number, since 3×2231305021³ (a number of 29 digits) contains 333 as substring.

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 2231305021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2231305061) 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 3 ways as a sum of consecutive naturals, for example, 101422945 + ... + 101422966.

It is an arithmetic number, because the mean of its divisors is an integer number (608537736).

Almost surely, 2^2231305021 is an apocalyptic number.

It is an amenable number.

2231305021 is a deficient number, since it is larger than the sum of its proper divisors (202845923).

2231305021 is a wasteful number, since it uses less digits than its factorization.

2231305021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202845922.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 2231305021 is about 47236.6914696616. The cubic root of 2231305021 is about 1306.7313613831.

Adding to 2231305021 its reverse (1205031322), we get a palindrome (3436336343).

The spelling of 2231305021 in words is "two billion, two hundred thirty-one million, three hundred five thousand, twenty-one".