7225231021 has 2 divisors, whose sum is σ = 7225231022. Its totient is φ = 7225231020.

The previous prime is 7225230959. The next prime is 7225231033. The reversal of 7225231021 is 1201325227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5281655625 + 1943575396 = 72675^2 + 44086^2 .

It is an emirp because it is prime and its reverse (1201325227) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7225231021 - 2²⁹ = 6688360109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7225231051) 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 as a sum of consecutive naturals, namely, 3612615510 + 3612615511.

It is an arithmetic number, because the mean of its divisors is an integer number (3612615511).

Almost surely, 2^7225231021 is an apocalyptic number.

It is an amenable number.

7225231021 is a deficient number, since it is larger than the sum of its proper divisors (1).

7225231021 is an equidigital number, since it uses as much as digits as its factorization.

7225231021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 7225231021 is about 85001.3589361958. The cubic root of 7225231021 is about 1933.2317213309.

Adding to 7225231021 its reverse (1201325227), we get a palindrome (8426556248).

The spelling of 7225231021 in words is "seven billion, two hundred twenty-five million, two hundred thirty-one thousand, twenty-one".