221434342351 has 2 divisors, whose sum is σ = 221434342352. Its totient is φ = 221434342350.

The previous prime is 221434342309. The next prime is 221434342399. The reversal of 221434342351 is 153243434122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221434342351 - 2¹⁷ = 221434211279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221434372351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110717171175 + 110717171176.

It is an arithmetic number, because the mean of its divisors is an integer number (110717171176).

Almost surely, 2^221434342351 is an apocalyptic number.

221434342351 is a deficient number, since it is larger than the sum of its proper divisors (1).

221434342351 is an equidigital number, since it uses as much as digits as its factorization.

221434342351 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 34.

Adding to 221434342351 its reverse (153243434122), we get a palindrome (374677776473).

The spelling of 221434342351 in words is "two hundred twenty-one billion, four hundred thirty-four million, three hundred forty-two thousand, three hundred fifty-one".