221434342309 has 2 divisors, whose sum is σ = 221434342310. Its totient is φ = 221434342308.

The previous prime is 221434342291. The next prime is 221434342351. The reversal of 221434342309 is 903243434122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168179549409 + 53254792900 = 410097^2 + 230770^2 .

It is a cyclic number.

It is not a de Polignac number, because 221434342309 - 2²¹ = 221432245157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221434342399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110717171154 + 110717171155.

It is an arithmetic number, because the mean of its divisors is an integer number (110717171155).

Almost surely, 2^221434342309 is an apocalyptic number.

It is an amenable number.

221434342309 is a deficient number, since it is larger than the sum of its proper divisors (1).

221434342309 is an equidigital number, since it uses as much as digits as its factorization.

221434342309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 37.

The spelling of 221434342309 in words is "two hundred twenty-one billion, four hundred thirty-four million, three hundred forty-two thousand, three hundred nine".