221425311 has 4 divisors (see below), whose sum is σ = 295233752. Its totient is φ = 147616872.

The previous prime is 221425283. The next prime is 221425313. The reversal of 221425311 is 113524122.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 221425311 - 2¹¹ = 221423263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221425313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36904216 + ... + 36904221.

It is an arithmetic number, because the mean of its divisors is an integer number (73808438).

Almost surely, 2^221425311 is an apocalyptic number.

221425311 is a deficient number, since it is larger than the sum of its proper divisors (73808441).

221425311 is an equidigital number, since it uses as much as digits as its factorization.

221425311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73808440.

The product of its digits is 480, while the sum is 21.

The square root of 221425311 is about 14880.3666285478. The cubic root of 221425311 is about 604.9819551570.

Adding to 221425311 its reverse (113524122), we get a palindrome (334949433).

The spelling of 221425311 in words is "two hundred twenty-one million, four hundred twenty-five thousand, three hundred eleven".