7198449137021 has 2 divisors, whose sum is σ = 7198449137022. Its totient is φ = 7198449137020.

The previous prime is 7198449137017. The next prime is 7198449137063. The reversal of 7198449137021 is 1207319448917.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4865284536121 + 2333164600900 = 2205739^2 + 1527470^2 .

It is a cyclic number.

It is not a de Polignac number, because 7198449137021 - 2² = 7198449137017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7198449137221) 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, 3599224568510 + 3599224568511.

It is an arithmetic number, because the mean of its divisors is an integer number (3599224568511).

Almost surely, 2^{7198449137021} is an apocalyptic number.

It is an amenable number.

7198449137021 is a deficient number, since it is larger than the sum of its proper divisors (1).

7198449137021 is an equidigital number, since it uses as much as digits as its factorization.

7198449137021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3048192, while the sum is 56.

The spelling of 7198449137021 in words is "seven trillion, one hundred ninety-eight billion, four hundred forty-nine million, one hundred thirty-seven thousand, twenty-one".