21221211112097 has 2 divisors, whose sum is σ = 21221211112098. Its totient is φ = 21221211112096.

The previous prime is 21221211112091. The next prime is 21221211112181. The reversal of 21221211112097 is 79021111212212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14110007556241 + 7111203555856 = 3756329^2 + 2666684^2 .

It is a cyclic number.

It is not a de Polignac number, because 21221211112097 - 2⁴⁰ = 20121699484321 is a prime.

It is not a weakly prime, because it can be changed into another prime (21221211112091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610605556048 + 10610605556049.

It is an arithmetic number, because the mean of its divisors is an integer number (10610605556049).

Almost surely, 2^{21221211112097} is an apocalyptic number.

It is an amenable number.

21221211112097 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221211112097 is an equidigital number, since it uses as much as digits as its factorization.

21221211112097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 32.

The spelling of 21221211112097 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred eleven million, one hundred twelve thousand, ninety-seven".