221784339229 has 2 divisors, whose sum is σ = 221784339230. Its totient is φ = 221784339228.

The previous prime is 221784339199. The next prime is 221784339277. The reversal of 221784339229 is 922933487122.

It is a happy number.

221784339229 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 can be written as a sum of positive squares in only one way, i.e., 197737634329 + 24046704900 = 444677^2 + 155070^2 .

It is a cyclic number.

It is not a de Polignac number, because 221784339229 - 2¹⁵ = 221784306461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221784339299) 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, 110892169614 + 110892169615.

It is an arithmetic number, because the mean of its divisors is an integer number (110892169615).

Almost surely, 2^221784339229 is an apocalyptic number.

It is an amenable number.

221784339229 is a deficient number, since it is larger than the sum of its proper divisors (1).

221784339229 is an equidigital number, since it uses as much as digits as its factorization.

221784339229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2612736, while the sum is 52.

The spelling of 221784339229 in words is "two hundred twenty-one billion, seven hundred eighty-four million, three hundred thirty-nine thousand, two hundred twenty-nine".