10212109999891 has 2 divisors, whose sum is σ = 10212109999892. Its totient is φ = 10212109999890.

The previous prime is 10212109999859. The next prime is 10212110000009. The reversal of 10212109999891 is 19899990121201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 10212109999891 - 2⁵ = 10212109999859 is a prime.

It is not a weakly prime, because it can be changed into another prime (10212109999841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5106054999945 + 5106054999946.

It is an arithmetic number, because the mean of its divisors is an integer number (5106054999946).

Almost surely, 2^{10212109999891} is an apocalyptic number.

10212109999891 is a deficient number, since it is larger than the sum of its proper divisors (1).

10212109999891 is an equidigital number, since it uses as much as digits as its factorization.

10212109999891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1889568, while the sum is 61.

The spelling of 10212109999891 in words is "ten trillion, two hundred twelve billion, one hundred nine million, nine hundred ninety-nine thousand, eight hundred ninety-one".