221211999097 has 2 divisors, whose sum is σ = 221211999098. Its totient is φ = 221211999096.

The previous prime is 221211999079. The next prime is 221211999119. The reversal of 221211999097 is 790999112122.

221211999097 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (221211999079) 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., 214002460816 + 7209538281 = 462604^2 + 84909^2 .

It is a cyclic number.

It is not a de Polignac number, because 221211999097 - 2¹¹ = 221211997049 is a prime.

It is a super-2 number, since 2×221211999097² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221211999007) 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, 110605999548 + 110605999549.

It is an arithmetic number, because the mean of its divisors is an integer number (110605999549).

Almost surely, 2^221211999097 is an apocalyptic number.

It is an amenable number.

221211999097 is a deficient number, since it is larger than the sum of its proper divisors (1).

221211999097 is an equidigital number, since it uses as much as digits as its factorization.

221211999097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 367416, while the sum is 52.

The spelling of 221211999097 in words is "two hundred twenty-one billion, two hundred eleven million, nine hundred ninety-nine thousand, ninety-seven".