221776124243 has 2 divisors, whose sum is σ = 221776124244. Its totient is φ = 221776124242.

The previous prime is 221776124237. The next prime is 221776124287. The reversal of 221776124243 is 342421677122.

It is a happy number.

221776124243 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 221776124243 - 2¹² = 221776120147 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221776124243.

It is not a weakly prime, because it can be changed into another prime (221776124233) 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, 110888062121 + 110888062122.

It is an arithmetic number, because the mean of its divisors is an integer number (110888062122).

Almost surely, 2^221776124243 is an apocalyptic number.

221776124243 is a deficient number, since it is larger than the sum of its proper divisors (1).

221776124243 is an equidigital number, since it uses as much as digits as its factorization.

221776124243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 225792, while the sum is 41.

The spelling of 221776124243 in words is "two hundred twenty-one billion, seven hundred seventy-six million, one hundred twenty-four thousand, two hundred forty-three".