221343430 has 64 divisors (see below), whose sum is σ = 499074048. Its totient is φ = 68664960.

The previous prime is 221343371. The next prime is 221343433. The reversal of 221343430 is 34343122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221343433) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 201964 + ... + 203056.

It is an arithmetic number, because the mean of its divisors is an integer number (7798032).

Almost surely, 2^221343430 is an apocalyptic number.

221343430 is an abundant number, since it is smaller than the sum of its proper divisors (277730618).

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

221343430 is a wasteful number, since it uses less digits than its factorization.

221343430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1381.

The product of its (nonzero) digits is 1728, while the sum is 22.

The square root of 221343430 is about 14877.6150642500. The cubic root of 221343430 is about 604.9073737484.

Adding to 221343430 its reverse (34343122), we get a palindrome (255686552).

The spelling of 221343430 in words is "two hundred twenty-one million, three hundred forty-three thousand, four hundred thirty".