221001212212189 has 2 divisors, whose sum is σ = 221001212212190. Its totient is φ = 221001212212188.

The previous prime is 221001212212169. The next prime is 221001212212267. The reversal of 221001212212189 is 981212212100122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149305060712025 + 71696151500164 = 12219045^2 + 8467358^2 .

It is a cyclic number.

It is not a de Polignac number, because 221001212212189 - 2³⁵ = 220966852473821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221001212212169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110500606106094 + 110500606106095.

It is an arithmetic number, because the mean of its divisors is an integer number (110500606106095).

Almost surely, 2^{221001212212189} is an apocalyptic number.

It is an amenable number.

221001212212189 is a deficient number, since it is larger than the sum of its proper divisors (1).

221001212212189 is an equidigital number, since it uses as much as digits as its factorization.

221001212212189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 34.

The spelling of 221001212212189 in words is "two hundred twenty-one trillion, one billion, two hundred twelve million, two hundred twelve thousand, one hundred eighty-nine".