221406143 has 8 divisors (see below), whose sum is σ = 258419712. Its totient is φ = 185738616.

The previous prime is 221406121. The next prime is 221406151. The reversal of 221406143 is 341604122.

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

It is not a de Polignac number, because 221406143 - 2²⁰ = 220357567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221406193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 336155 + ... + 336812.

It is an arithmetic number, because the mean of its divisors is an integer number (32302464).

Almost surely, 2^221406143 is an apocalyptic number.

221406143 is a deficient number, since it is larger than the sum of its proper divisors (37013569).

221406143 is an equidigital number, since it uses as much as digits as its factorization.

221406143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673021.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 221406143 is about 14879.7225444563. The cubic root of 221406143 is about 604.9644976093.

The spelling of 221406143 in words is "two hundred twenty-one million, four hundred six thousand, one hundred forty-three".