101212120991 has 2 divisors, whose sum is σ = 101212120992. Its totient is φ = 101212120990.

The previous prime is 101212120981. The next prime is 101212121029. The reversal of 101212120991 is 199021212101.

It is a weak prime.

It is an emirp because it is prime and its reverse (199021212101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 101212120991 - 2¹⁴ = 101212104607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101212120901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50606060495 + 50606060496.

It is an arithmetic number, because the mean of its divisors is an integer number (50606060496).

Almost surely, 2^101212120991 is an apocalyptic number.

101212120991 is a deficient number, since it is larger than the sum of its proper divisors (1).

101212120991 is an equidigital number, since it uses as much as digits as its factorization.

101212120991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 29.

The spelling of 101212120991 in words is "one hundred one billion, two hundred twelve million, one hundred twenty thousand, nine hundred ninety-one".