99999580000421 has 2 divisors, whose sum is σ = 99999580000422. Its totient is φ = 99999580000420.

The previous prime is 99999580000403. The next prime is 99999580000427. The reversal of 99999580000421 is 12400008599999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81980149295521 + 18019430704900 = 9054289^2 + 4244930^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99999580000421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99999580000427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49999790000210 + 49999790000211.

It is an arithmetic number, because the mean of its divisors is an integer number (49999790000211).

Almost surely, 2^{99999580000421} is an apocalyptic number.

It is an amenable number.

99999580000421 is a deficient number, since it is larger than the sum of its proper divisors (1).

99999580000421 is an equidigital number, since it uses as much as digits as its factorization.

99999580000421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18895680, while the sum is 65.

The spelling of 99999580000421 in words is "ninety-nine trillion, nine hundred ninety-nine billion, five hundred eighty million, four hundred twenty-one", and thus it is an aban number.