221143434 has 16 divisors (see below), whose sum is σ = 443446272. Its totient is φ = 73521248.

The previous prime is 221143423. The next prime is 221143441. The reversal of 221143434 is 434341122.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45819 + ... + 50414.

It is an arithmetic number, because the mean of its divisors is an integer number (27715392).

Almost surely, 2^221143434 is an apocalyptic number.

221143434 is an abundant number, since it is smaller than the sum of its proper divisors (222302838).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221143434 is a wasteful number, since it uses less digits than its factorization.

221143434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96621.

The product of its digits is 2304, while the sum is 24.

The square root of 221143434 is about 14870.8921722942. The cubic root of 221143434 is about 604.7251297871.

Adding to 221143434 its reverse (434341122), we get a palindrome (655484556).

The spelling of 221143434 in words is "two hundred twenty-one million, one hundred forty-three thousand, four hundred thirty-four".