221235542824091 has 2 divisors, whose sum is σ = 221235542824092. Its totient is φ = 221235542824090.

The previous prime is 221235542824039. The next prime is 221235542824133. The reversal of 221235542824091 is 190428245532122.

221235542824091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221235542824091 - 2¹⁰ = 221235542823067 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (221235542824591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110617771412045 + 110617771412046.

It is an arithmetic number, because the mean of its divisors is an integer number (110617771412046).

Almost surely, 2^{221235542824091} is an apocalyptic number.

221235542824091 is a deficient number, since it is larger than the sum of its proper divisors (1).

221235542824091 is an equidigital number, since it uses as much as digits as its factorization.

221235542824091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2764800, while the sum is 50.

The spelling of 221235542824091 in words is "two hundred twenty-one trillion, two hundred thirty-five billion, five hundred forty-two million, eight hundred twenty-four thousand, ninety-one".