221431430 has 16 divisors (see below), whose sum is σ = 434811024. Its totient is φ = 80520480.

The previous prime is 221431423. The next prime is 221431439. The reversal of 221431430 is 34134122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221431439) by changing a digit.

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, 1006397 + ... + 1006616.

It is an arithmetic number, because the mean of its divisors is an integer number (27175689).

Almost surely, 2^221431430 is an apocalyptic number.

221431430 is a deficient number, since it is larger than the sum of its proper divisors (213379594).

221431430 is a wasteful number, since it uses less digits than its factorization.

221431430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2013031.

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

The square root of 221431430 is about 14880.5722336206. The cubic root of 221431430 is about 604.9875279172.

Adding to 221431430 its reverse (34134122), we get a palindrome (255565552).

The spelling of 221431430 in words is "two hundred twenty-one million, four hundred thirty-one thousand, four hundred thirty".