221201121091 has 2 divisors, whose sum is σ = 221201121092. Its totient is φ = 221201121090.

The previous prime is 221201121083. The next prime is 221201121103. The reversal of 221201121091 is 190121102122.

221201121091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221201121091 - 2³ = 221201121083 is a prime.

It is not a weakly prime, because it can be changed into another prime (221201121061) 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, 110600560545 + 110600560546.

It is an arithmetic number, because the mean of its divisors is an integer number (110600560546).

Almost surely, 2^221201121091 is an apocalyptic number.

221201121091 is a deficient number, since it is larger than the sum of its proper divisors (1).

221201121091 is an equidigital number, since it uses as much as digits as its factorization.

221201121091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 221201121091 in words is "two hundred twenty-one billion, two hundred one million, one hundred twenty-one thousand, ninety-one".