90432340421 has 2 divisors, whose sum is σ = 90432340422. Its totient is φ = 90432340420.

The previous prime is 90432340387. The next prime is 90432340513. The reversal of 90432340421 is 12404323409.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58520448100 + 31911892321 = 241910^2 + 178639^2 .

It is an emirp because it is prime and its reverse (12404323409) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90432340421 - 2³⁰ = 89358598597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90432340721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45216170210 + 45216170211.

It is an arithmetic number, because the mean of its divisors is an integer number (45216170211).

Almost surely, 2^90432340421 is an apocalyptic number.

It is an amenable number.

90432340421 is a deficient number, since it is larger than the sum of its proper divisors (1).

90432340421 is an equidigital number, since it uses as much as digits as its factorization.

90432340421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 32.

The spelling of 90432340421 in words is "ninety billion, four hundred thirty-two million, three hundred forty thousand, four hundred twenty-one".