7321012121 has 2 divisors, whose sum is σ = 7321012122. Its totient is φ = 7321012120.

The previous prime is 7321012103. The next prime is 7321012147. The reversal of 7321012121 is 1212101237.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5947494400 + 1373517721 = 77120^2 + 37061^2 .

It is an emirp because it is prime and its reverse (1212101237) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7321012121 - 2⁶ = 7321012057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7321012093 and 7321012102.

It is not a weakly prime, because it can be changed into another prime (7321042121) 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 as a sum of consecutive naturals, namely, 3660506060 + 3660506061.

It is an arithmetic number, because the mean of its divisors is an integer number (3660506061).

Almost surely, 2^7321012121 is an apocalyptic number.

It is an amenable number.

7321012121 is a deficient number, since it is larger than the sum of its proper divisors (1).

7321012121 is an equidigital number, since it uses as much as digits as its factorization.

7321012121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 7321012121 is about 85562.9132334798. The cubic root of 7321012121 is about 1941.7368617487.

Adding to 7321012121 its reverse (1212101237), we get a palindrome (8533113358).

The spelling of 7321012121 in words is "seven billion, three hundred twenty-one million, twelve thousand, one hundred twenty-one".