99421033661 has 2 divisors, whose sum is σ = 99421033662. Its totient is φ = 99421033660.

The previous prime is 99421033603. The next prime is 99421033669. The reversal of 99421033661 is 16633012499.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59343396025 + 40077637636 = 243605^2 + 200194^2 .

It is an emirp because it is prime and its reverse (16633012499) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99421033661 - 2⁶ = 99421033597 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99421033669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49710516830 + 49710516831.

It is an arithmetic number, because the mean of its divisors is an integer number (49710516831).

Almost surely, 2^99421033661 is an apocalyptic number.

It is an amenable number.

99421033661 is a deficient number, since it is larger than the sum of its proper divisors (1).

99421033661 is an equidigital number, since it uses as much as digits as its factorization.

99421033661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 44.

The spelling of 99421033661 in words is "ninety-nine billion, four hundred twenty-one million, thirty-three thousand, six hundred sixty-one".