71584044421 has 2 divisors, whose sum is σ = 71584044422. Its totient is φ = 71584044420.

The previous prime is 71584044379. The next prime is 71584044449. The reversal of 71584044421 is 12444048517.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59481844321 + 12102200100 = 243889^2 + 110010^2 .

It is a cyclic number.

It is not a de Polignac number, because 71584044421 - 2⁷ = 71584044293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71584044821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35792022210 + 35792022211.

It is an arithmetic number, because the mean of its divisors is an integer number (35792022211).

Almost surely, 2^71584044421 is an apocalyptic number.

It is an amenable number.

71584044421 is a deficient number, since it is larger than the sum of its proper divisors (1).

71584044421 is an equidigital number, since it uses as much as digits as its factorization.

71584044421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 143360, while the sum is 40.

The spelling of 71584044421 in words is "seventy-one billion, five hundred eighty-four million, forty-four thousand, four hundred twenty-one".