221433245 has 24 divisors (see below), whose sum is σ = 307952928. Its totient is φ = 151558400.

The previous prime is 221433227. The next prime is 221433257. The reversal of 221433245 is 542334122.

It is not a de Polignac number, because 221433245 - 2²⁰ = 220384669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8930 + ... + 22860.

It is an arithmetic number, because the mean of its divisors is an integer number (12831372).

Almost surely, 2^221433245 is an apocalyptic number.

It is an amenable number.

221433245 is a deficient number, since it is larger than the sum of its proper divisors (86519683).

221433245 is a wasteful number, since it uses less digits than its factorization.

221433245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13981 (or 13964 counting only the distinct ones).

The product of its digits is 5760, while the sum is 26.

The square root of 221433245 is about 14880.6332190535. The cubic root of 221433245 is about 604.9891808734.

Adding to 221433245 its reverse (542334122), we get a palindrome (763767367).

The spelling of 221433245 in words is "two hundred twenty-one million, four hundred thirty-three thousand, two hundred forty-five".