10212578397991 has 2 divisors, whose sum is σ = 10212578397992. Its totient is φ = 10212578397990.

The previous prime is 10212578397979. The next prime is 10212578398013. The reversal of 10212578397991 is 19979387521201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 10212578397991 - 2¹³ = 10212578389799 is a prime.

It is a super-2 number, since 2×10212578397991² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10212578397941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5106289198995 + 5106289198996.

It is an arithmetic number, because the mean of its divisors is an integer number (5106289198996).

Almost surely, 2^{10212578397991} is an apocalyptic number.

10212578397991 is a deficient number, since it is larger than the sum of its proper divisors (1).

10212578397991 is an equidigital number, since it uses as much as digits as its factorization.

10212578397991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17146080, while the sum is 64.

The spelling of 10212578397991 in words is "ten trillion, two hundred twelve billion, five hundred seventy-eight million, three hundred ninety-seven thousand, nine hundred ninety-one".