221430032 has 20 divisors (see below), whose sum is σ = 454257756. Its totient is φ = 104202240.

The previous prime is 221430029. The next prime is 221430037. The reversal of 221430032 is 230034122.

It can be written as a sum of positive squares in 2 ways, for example, as 132618256 + 88811776 = 11516^2 + 9424^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is not an unprimeable number, because it can be changed into a prime (221430037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 406769 + ... + 407312.

Almost surely, 2^221430032 is an apocalyptic number.

It is an amenable number.

221430032 is an abundant number, since it is smaller than the sum of its proper divisors (232827724).

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

221430032 is a wasteful number, since it uses less digits than its factorization.

221430032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814106 (or 814100 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 221430032 is about 14880.5252595465. The cubic root of 221430032 is about 604.9862547249.

Adding to 221430032 its reverse (230034122), we get a palindrome (451464154).

The spelling of 221430032 in words is "two hundred twenty-one million, four hundred thirty thousand, thirty-two".