84791310421 has 2 divisors, whose sum is σ = 84791310422. Its totient is φ = 84791310420.

The previous prime is 84791310403. The next prime is 84791310467. The reversal of 84791310421 is 12401319748.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49467987396 + 35323323025 = 222414^2 + 187945^2 .

It is a cyclic number.

It is not a de Polignac number, because 84791310421 - 2⁵ = 84791310389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84791311421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42395655210 + 42395655211.

It is an arithmetic number, because the mean of its divisors is an integer number (42395655211).

Almost surely, 2^84791310421 is an apocalyptic number.

It is an amenable number.

84791310421 is a deficient number, since it is larger than the sum of its proper divisors (1).

84791310421 is an equidigital number, since it uses as much as digits as its factorization.

84791310421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 40.

The spelling of 84791310421 in words is "eighty-four billion, seven hundred ninety-one million, three hundred ten thousand, four hundred twenty-one".