221431330 has 8 divisors (see below), whose sum is σ = 398576412. Its totient is φ = 88572528.

The previous prime is 221431313. The next prime is 221431333. The reversal of 221431330 is 33134122.

It can be written as a sum of positive squares in 2 ways, for example, as 192626641 + 28804689 = 13879^2 + 5367^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 221431298 and 221431307.

It is not an unprimeable number, because it can be changed into a prime (221431333) 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, 11071557 + ... + 11071576.

Almost surely, 2^221431330 is an apocalyptic number.

221431330 is a deficient number, since it is larger than the sum of its proper divisors (177145082).

221431330 is a wasteful number, since it uses less digits than its factorization.

221431330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22143140.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 221431330 is about 14880.5688735344. The cubic root of 221431330 is about 604.9874368450.

Adding to 221431330 its reverse (33134122), we get a palindrome (254565452).

The spelling of 221431330 in words is "two hundred twenty-one million, four hundred thirty-one thousand, three hundred thirty".