221212113 has 8 divisors (see below), whose sum is σ = 295161888. Its totient is φ = 147368544.

The previous prime is 221212111. The next prime is 221212129. The reversal of 221212113 is 311212122.

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

It is not a de Polignac number, because 221212113 - 2¹ = 221212111 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221212092 and 221212101.

It is not an unprimeable number, because it can be changed into a prime (221212111) 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 7 ways as a sum of consecutive naturals, for example, 21556 + ... + 30117.

It is an arithmetic number, because the mean of its divisors is an integer number (36895236).

Almost surely, 2^221212113 is an apocalyptic number.

It is an amenable number.

221212113 is a deficient number, since it is larger than the sum of its proper divisors (73949775).

221212113 is a wasteful number, since it uses less digits than its factorization.

221212113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53103.

The product of its digits is 48, while the sum is 15.

The square root of 221212113 is about 14873.2011685447. The cubic root of 221212113 is about 604.7877250866.

Adding to 221212113 its reverse (311212122), we get a palindrome (532424235).

Subtracting 221212113 from its reverse (311212122), we obtain a palindrome (90000009).

The spelling of 221212113 in words is "two hundred twenty-one million, two hundred twelve thousand, one hundred thirteen".