221222020091 has 2 divisors, whose sum is σ = 221222020092. Its totient is φ = 221222020090.

The previous prime is 221222020079. The next prime is 221222020099. The reversal of 221222020091 is 190020222122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221222020091 - 2³⁰ = 220148278267 is a prime.

It is not a weakly prime, because it can be changed into another prime (221222020099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110611010045 + 110611010046.

It is an arithmetic number, because the mean of its divisors is an integer number (110611010046).

Almost surely, 2^221222020091 is an apocalyptic number.

221222020091 is a deficient number, since it is larger than the sum of its proper divisors (1).

221222020091 is an equidigital number, since it uses as much as digits as its factorization.

221222020091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

The spelling of 221222020091 in words is "two hundred twenty-one billion, two hundred twenty-two million, twenty thousand, ninety-one".