221404143 has 8 divisors (see below), whose sum is σ = 298522800. Its totient is φ = 145944128.

The previous prime is 221404133. The next prime is 221404171. The reversal of 221404143 is 341404122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221404143 - 2⁵ = 221404111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221404123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 414348 + ... + 414881.

It is an arithmetic number, because the mean of its divisors is an integer number (37315350).

Almost surely, 2^221404143 is an apocalyptic number.

221404143 is a deficient number, since it is larger than the sum of its proper divisors (77118657).

221404143 is an equidigital number, since it uses as much as digits as its factorization.

221404143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 829321.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 221404143 is about 14879.6553387503. The cubic root of 221404143 is about 604.9626760209.

Subtracting from 221404143 its sum of digits (21), we obtain a palindrome (221404122).

Adding to 221404143 its reverse (341404122), we get a palindrome (562808265).

The spelling of 221404143 in words is "two hundred twenty-one million, four hundred four thousand, one hundred forty-three".