212221244409991 has 2 divisors, whose sum is σ = 212221244409992. Its totient is φ = 212221244409990.

The previous prime is 212221244409931. The next prime is 212221244410061. The reversal of 212221244409991 is 199904442122212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212221244409991 - 2¹⁵ = 212221244377223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212221244409931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106110622204995 + 106110622204996.

It is an arithmetic number, because the mean of its divisors is an integer number (106110622204996).

Almost surely, 2^{212221244409991} is an apocalyptic number.

212221244409991 is a deficient number, since it is larger than the sum of its proper divisors (1).

212221244409991 is an equidigital number, since it uses as much as digits as its factorization.

212221244409991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1492992, while the sum is 52.

The spelling of 212221244409991 in words is "two hundred twelve trillion, two hundred twenty-one billion, two hundred forty-four million, four hundred nine thousand, nine hundred ninety-one".