21220221211097 has 2 divisors, whose sum is σ = 21220221211098. Its totient is φ = 21220221211096.

The previous prime is 21220221211043. The next prime is 21220221211117. The reversal of 21220221211097 is 79011212202212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14247748595161 + 6972472615936 = 3774619^2 + 2640544^2 .

It is a cyclic number.

It is not a de Polignac number, because 21220221211097 - 2¹⁰ = 21220221210073 is a prime.

It is not a weakly prime, because it can be changed into another prime (21220221211997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610110605548 + 10610110605549.

It is an arithmetic number, because the mean of its divisors is an integer number (10610110605549).

Almost surely, 2^{21220221211097} is an apocalyptic number.

It is an amenable number.

21220221211097 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220221211097 is an equidigital number, since it uses as much as digits as its factorization.

21220221211097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 32.

The spelling of 21220221211097 in words is "twenty-one trillion, two hundred twenty billion, two hundred twenty-one million, two hundred eleven thousand, ninety-seven".