221010222197 has 2 divisors, whose sum is σ = 221010222198. Its totient is φ = 221010222196.

The previous prime is 221010222179. The next prime is 221010222271. The reversal of 221010222197 is 791222010122.

Together with previous prime (221010222179) 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., 180008427076 + 41001795121 = 424274^2 + 202489^2 .

It is a cyclic number.

It is not a de Polignac number, because 221010222197 - 2⁸ = 221010221941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221010222137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110505111098 + 110505111099.

It is an arithmetic number, because the mean of its divisors is an integer number (110505111099).

Almost surely, 2^221010222197 is an apocalyptic number.

It is an amenable number.

221010222197 is a deficient number, since it is larger than the sum of its proper divisors (1).

221010222197 is an equidigital number, since it uses as much as digits as its factorization.

221010222197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 29.

The spelling of 221010222197 in words is "two hundred twenty-one billion, ten million, two hundred twenty-two thousand, one hundred ninety-seven".