71212306606891 has 2 divisors, whose sum is σ = 71212306606892. Its totient is φ = 71212306606890.

The previous prime is 71212306606843. The next prime is 71212306606997. The reversal of 71212306606891 is 19860660321217.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71212306606891 - 2²³ = 71212298218283 is a prime.

It is a super-2 number, since 2×71212306606891² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71212306606801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35606153303445 + 35606153303446.

It is an arithmetic number, because the mean of its divisors is an integer number (35606153303446).

Almost surely, 2^{71212306606891} is an apocalyptic number.

71212306606891 is a deficient number, since it is larger than the sum of its proper divisors (1).

71212306606891 is an equidigital number, since it uses as much as digits as its factorization.

71212306606891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1306368, while the sum is 52.

The spelling of 71212306606891 in words is "seventy-one trillion, two hundred twelve billion, three hundred six million, six hundred six thousand, eight hundred ninety-one".