221035143 has 16 divisors (see below), whose sum is σ = 339966720. Its totient is φ = 125124096.

The previous prime is 221035109. The next prime is 221035153. The reversal of 221035143 is 341530122.

It is not a de Polignac number, because 221035143 - 2²⁴ = 204257927 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221035103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46938 + ... + 51431.

It is an arithmetic number, because the mean of its divisors is an integer number (21247920).

Almost surely, 2^221035143 is an apocalyptic number.

221035143 is a deficient number, since it is larger than the sum of its proper divisors (118931577).

221035143 is a wasteful number, since it uses less digits than its factorization.

221035143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98486.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 221035143 is about 14867.2506873329. The cubic root of 221035143 is about 604.6264050514.

Adding to 221035143 its reverse (341530122), we get a palindrome (562565265).

The spelling of 221035143 in words is "two hundred twenty-one million, thirty-five thousand, one hundred forty-three".