221056354121263 has 2 divisors, whose sum is σ = 221056354121264. Its totient is φ = 221056354121262.

The previous prime is 221056354121167. The next prime is 221056354121363. The reversal of 221056354121263 is 362121453650122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221056354121263 - 2²¹ = 221056352024111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221056354121363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110528177060631 + 110528177060632.

It is an arithmetic number, because the mean of its divisors is an integer number (110528177060632).

Almost surely, 2^{221056354121263} is an apocalyptic number.

221056354121263 is a deficient number, since it is larger than the sum of its proper divisors (1).

221056354121263 is an equidigital number, since it uses as much as digits as its factorization.

221056354121263 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 518400, while the sum is 43.

The spelling of 221056354121263 in words is "two hundred twenty-one trillion, fifty-six billion, three hundred fifty-four million, one hundred twenty-one thousand, two hundred sixty-three".