221425210 has 8 divisors (see below), whose sum is σ = 398565396. Its totient is φ = 88570080.

The previous prime is 221425199. The next prime is 221425241. The reversal of 221425210 is 12524122.

It can be written as a sum of positive squares in 2 ways, for example, as 217061289 + 4363921 = 14733^2 + 2089^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11071251 + ... + 11071270.

Almost surely, 2^221425210 is an apocalyptic number.

221425210 is a deficient number, since it is larger than the sum of its proper divisors (177140186).

221425210 is a wasteful number, since it uses less digits than its factorization.

221425210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22142528.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 221425210 is about 14880.3632348139. The cubic root of 221425210 is about 604.9818631723.

Adding to 221425210 its reverse (12524122), we get a palindrome (233949332).

The spelling of 221425210 in words is "two hundred twenty-one million, four hundred twenty-five thousand, two hundred ten".