221424130 has 8 divisors (see below), whose sum is σ = 398563452. Its totient is φ = 88569648.

The previous prime is 221424127. The next prime is 221424139. The reversal of 221424130 is 31424122.

It can be written as a sum of positive squares in 2 ways, for example, as 184226329 + 37197801 = 13573^2 + 6099^2 .

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 = 221424098 and 221424107.

It is not an unprimeable number, because it can be changed into a prime (221424139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11071197 + ... + 11071216.

Almost surely, 2^221424130 is an apocalyptic number.

221424130 is a deficient number, since it is larger than the sum of its proper divisors (177139322).

221424130 is a wasteful number, since it uses less digits than its factorization.

221424130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22142420.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 221424130 is about 14880.3269453329. The cubic root of 221424130 is about 604.9808795724.

Adding to 221424130 its reverse (31424122), we get a palindrome (252848252).

The spelling of 221424130 in words is "two hundred twenty-one million, four hundred twenty-four thousand, one hundred thirty".