7316821887121 has 2 divisors, whose sum is σ = 7316821887122. Its totient is φ = 7316821887120.

The previous prime is 7316821887119. The next prime is 7316821887157. The reversal of 7316821887121 is 1217881286137.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5162279364225 + 2154542522896 = 2272065^2 + 1467836^2 .

It is a cyclic number.

It is not a de Polignac number, because 7316821887121 - 2¹ = 7316821887119 is a prime.

Together with 7316821887119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (7316821887191) 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, 3658410943560 + 3658410943561.

It is an arithmetic number, because the mean of its divisors is an integer number (3658410943561).

Almost surely, 2^{7316821887121} is an apocalyptic number.

It is an amenable number.

7316821887121 is a deficient number, since it is larger than the sum of its proper divisors (1).

7316821887121 is an equidigital number, since it uses as much as digits as its factorization.

7316821887121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1806336, while the sum is 55.

The spelling of 7316821887121 in words is "seven trillion, three hundred sixteen billion, eight hundred twenty-one million, eight hundred eighty-seven thousand, one hundred twenty-one".