99174965421421 has 2 divisors, whose sum is σ = 99174965421422. Its totient is φ = 99174965421420.

The previous prime is 99174965421379. The next prime is 99174965421449. The reversal of 99174965421421 is 12412456947199.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78547699445796 + 20627265975625 = 8862714^2 + 4541725^2 .

It is a cyclic number.

It is not a de Polignac number, because 99174965421421 - 2¹³ = 99174965413229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99174965421451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49587482710710 + 49587482710711.

It is an arithmetic number, because the mean of its divisors is an integer number (49587482710711).

Almost surely, 2^{99174965421421} is an apocalyptic number.

It is an amenable number.

99174965421421 is a deficient number, since it is larger than the sum of its proper divisors (1).

99174965421421 is an equidigital number, since it uses as much as digits as its factorization.

99174965421421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39191040, while the sum is 64.

The spelling of 99174965421421 in words is "ninety-nine trillion, one hundred seventy-four billion, nine hundred sixty-five million, four hundred twenty-one thousand, four hundred twenty-one".