111221212100197 has 2 divisors, whose sum is σ = 111221212100198. Its totient is φ = 111221212100196.

The previous prime is 111221212100189. The next prime is 111221212100261. The reversal of 111221212100197 is 791001212122111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110604470461956 + 616741638241 = 10516866^2 + 785329^2 .

It is a cyclic number.

It is not a de Polignac number, because 111221212100197 - 2³ = 111221212100189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111221212100497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55610606050098 + 55610606050099.

It is an arithmetic number, because the mean of its divisors is an integer number (55610606050099).

Almost surely, 2^{111221212100197} is an apocalyptic number.

It is an amenable number.

111221212100197 is a deficient number, since it is larger than the sum of its proper divisors (1).

111221212100197 is an equidigital number, since it uses as much as digits as its factorization.

111221212100197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 31.

The spelling of 111221212100197 in words is "one hundred eleven trillion, two hundred twenty-one billion, two hundred twelve million, one hundred thousand, one hundred ninety-seven".