80105890421 has 2 divisors, whose sum is σ = 80105890422. Its totient is φ = 80105890420.

The previous prime is 80105890393. The next prime is 80105890433. The reversal of 80105890421 is 12409850108.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79572511396 + 533379025 = 282086^2 + 23095^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80105890421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80105890441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40052945210 + 40052945211.

It is an arithmetic number, because the mean of its divisors is an integer number (40052945211).

Almost surely, 2^80105890421 is an apocalyptic number.

It is an amenable number.

80105890421 is a deficient number, since it is larger than the sum of its proper divisors (1).

80105890421 is an equidigital number, since it uses as much as digits as its factorization.

80105890421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 38.

The spelling of 80105890421 in words is "eighty billion, one hundred five million, eight hundred ninety thousand, four hundred twenty-one".