97986118421 has 2 divisors, whose sum is σ = 97986118422. Its totient is φ = 97986118420.

The previous prime is 97986118387. The next prime is 97986118429. The reversal of 97986118421 is 12481168979.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95079722500 + 2906395921 = 308350^2 + 53911^2 .

It is a cyclic number.

It is not a de Polignac number, because 97986118421 - 2¹⁸ = 97985856277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97986118429) 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, 48993059210 + 48993059211.

It is an arithmetic number, because the mean of its divisors is an integer number (48993059211).

Almost surely, 2^97986118421 is an apocalyptic number.

It is an amenable number.

97986118421 is a deficient number, since it is larger than the sum of its proper divisors (1).

97986118421 is an equidigital number, since it uses as much as digits as its factorization.

97986118421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1741824, while the sum is 56.

The spelling of 97986118421 in words is "ninety-seven billion, nine hundred eighty-six million, one hundred eighteen thousand, four hundred twenty-one".