221401343 has 2 divisors, whose sum is σ = 221401344. Its totient is φ = 221401342.

The previous prime is 221401333. The next prime is 221401361. The reversal of 221401343 is 343104122.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221401343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221401333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110700671 + 110700672.

It is an arithmetic number, because the mean of its divisors is an integer number (110700672).

Almost surely, 2^221401343 is an apocalyptic number.

221401343 is a deficient number, since it is larger than the sum of its proper divisors (1).

221401343 is an equidigital number, since it uses as much as digits as its factorization.

221401343 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 221401343 is about 14879.5612502520. The cubic root of 221401343 is about 604.9601257786.

Adding to 221401343 its reverse (343104122), we get a palindrome (564505465).

The spelling of 221401343 in words is "two hundred twenty-one million, four hundred one thousand, three hundred forty-three".