21201222211097 has 2 divisors, whose sum is σ = 21201222211098. Its totient is φ = 21201222211096.

The previous prime is 21201222211079. The next prime is 21201222211121. The reversal of 21201222211097 is 79011222210212.

Together with previous prime (21201222211079) 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., 17955931653136 + 3245290557961 = 4237444^2 + 1801469^2 .

It is a cyclic number.

It is not a de Polignac number, because 21201222211097 - 2¹⁰ = 21201222210073 is a prime.

It is not a weakly prime, because it can be changed into another prime (21201222211997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600611105548 + 10600611105549.

It is an arithmetic number, because the mean of its divisors is an integer number (10600611105549).

Almost surely, 2^{21201222211097} is an apocalyptic number.

It is an amenable number.

21201222211097 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201222211097 is an equidigital number, since it uses as much as digits as its factorization.

21201222211097 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 21201222211097 in words is "twenty-one trillion, two hundred one billion, two hundred twenty-two million, two hundred eleven thousand, ninety-seven".