221221113 has 8 divisors (see below), whose sum is σ = 302933568. Its totient is φ = 143494704.

The previous prime is 221221097. The next prime is 221221127. The reversal of 221221113 is 311122122.

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

It is not a de Polignac number, because 221221113 - 2⁴ = 221221097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221221092 and 221221101.

It is not an unprimeable number, because it can be changed into a prime (221221213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 996381 + ... + 996602.

It is an arithmetic number, because the mean of its divisors is an integer number (37866696).

Almost surely, 2^221221113 is an apocalyptic number.

It is an amenable number.

221221113 is a deficient number, since it is larger than the sum of its proper divisors (81712455).

221221113 is a wasteful number, since it uses less digits than its factorization.

221221113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1993023.

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

The square root of 221221113 is about 14873.5037230640. The cubic root of 221221113 is about 604.7959268914.

Adding to 221221113 its reverse (311122122), we get a palindrome (532343235).

The spelling of 221221113 in words is "two hundred twenty-one million, two hundred twenty-one thousand, one hundred thirteen".