221056332491 has 2 divisors, whose sum is σ = 221056332492. Its totient is φ = 221056332490.

The previous prime is 221056332457. The next prime is 221056332517. The reversal of 221056332491 is 194233650122.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221056332491 - 2²⁶ = 220989223627 is a prime.

It is not a weakly prime, because it can be changed into another prime (221056332421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110528166245 + 110528166246.

It is an arithmetic number, because the mean of its divisors is an integer number (110528166246).

Almost surely, 2^221056332491 is an apocalyptic number.

221056332491 is a deficient number, since it is larger than the sum of its proper divisors (1).

221056332491 is an equidigital number, since it uses as much as digits as its factorization.

221056332491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 38.

The spelling of 221056332491 in words is "two hundred twenty-one billion, fifty-six million, three hundred thirty-two thousand, four hundred ninety-one".