71221105523 has 2 divisors, whose sum is σ = 71221105524. Its totient is φ = 71221105522.

The previous prime is 71221105519. The next prime is 71221105591. The reversal of 71221105523 is 32550112217.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71221105523 - 2² = 71221105519 is a prime.

It is a super-2 number, since 2×71221105523² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71221105513) 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, 35610552761 + 35610552762.

It is an arithmetic number, because the mean of its divisors is an integer number (35610552762).

Almost surely, 2^71221105523 is an apocalyptic number.

71221105523 is a deficient number, since it is larger than the sum of its proper divisors (1).

71221105523 is an equidigital number, since it uses as much as digits as its factorization.

71221105523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4200, while the sum is 29.

The spelling of 71221105523 in words is "seventy-one billion, two hundred twenty-one million, one hundred five thousand, five hundred twenty-three".