71930172408821 has 2 divisors, whose sum is σ = 71930172408822. Its totient is φ = 71930172408820.

The previous prime is 71930172408797. The next prime is 71930172408839. The reversal of 71930172408821 is 12880427103917.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63953784346321 + 7976388062500 = 7997111^2 + 2824250^2 .

It is a cyclic number.

It is not a de Polignac number, because 71930172408821 - 2²² = 71930168214517 is a prime.

It is a super-2 number, since 2×71930172408821² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71930172908821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35965086204410 + 35965086204411.

It is an arithmetic number, because the mean of its divisors is an integer number (35965086204411).

Almost surely, 2^{71930172408821} is an apocalyptic number.

It is an amenable number.

71930172408821 is a deficient number, since it is larger than the sum of its proper divisors (1).

71930172408821 is an equidigital number, since it uses as much as digits as its factorization.

71930172408821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1354752, while the sum is 53.

The spelling of 71930172408821 in words is "seventy-one trillion, nine hundred thirty billion, one hundred seventy-two million, four hundred eight thousand, eight hundred twenty-one".