21112221120997 has 2 divisors, whose sum is σ = 21112221120998. Its totient is φ = 21112221120996.

The previous prime is 21112221120979. The next prime is 21112221121073. The reversal of 21112221120997 is 79902112221112.

It is a happy number.

Together with previous prime (21112221120979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20291069802721 + 821151318276 = 4504561^2 + 906174^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112221120997 - 2³¹ = 21110073637349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21112221120937) 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, 10556110560498 + 10556110560499.

It is an arithmetic number, because the mean of its divisors is an integer number (10556110560499).

Almost surely, 2^{21112221120997} is an apocalyptic number.

It is an amenable number.

21112221120997 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112221120997 is an equidigital number, since it uses as much as digits as its factorization.

21112221120997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 40.

The spelling of 21112221120997 in words is "twenty-one trillion, one hundred twelve billion, two hundred twenty-one million, one hundred twenty thousand, nine hundred ninety-seven".