221444430 has 32 divisors (see below), whose sum is σ = 559440000. Its totient is φ = 55943712.

The previous prime is 221444423. The next prime is 221444459. The reversal of 221444430 is 34444122.

It is a happy number.

It is a super-3 number, since 3×221444430³ (a number of 26 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221444430.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 193680 + ... + 194819.

It is an arithmetic number, because the mean of its divisors is an integer number (17482500).

Almost surely, 2^221444430 is an apocalyptic number.

221444430 is an abundant number, since it is smaller than the sum of its proper divisors (337995570).

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

221444430 is a wasteful number, since it uses less digits than its factorization.

221444430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388528.

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 221444430 is about 14881.0090383683. The cubic root of 221444430 is about 604.9993670735. Note that the first 3 decimals are identical.

Adding to 221444430 its reverse (34444122), we get a palindrome (255888552).

The spelling of 221444430 in words is "two hundred twenty-one million, four hundred forty-four thousand, four hundred thirty".