221213116 has 12 divisors (see below), whose sum is σ = 387579640. Its totient is φ = 110476080.

The previous prime is 221213099. The next prime is 221213123. The reversal of 221213116 is 611312122.

It is a junction number, because it is equal to n+sod(n) for n = 221213093 and 221213102.

It is a congruent number.

It is an unprimeable number.

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, 28755 + ... + 35626.

Almost surely, 2^221213116 is an apocalyptic number.

It is an amenable number.

221213116 is a deficient number, since it is larger than the sum of its proper divisors (166366524).

221213116 is a wasteful number, since it uses less digits than its factorization.

221213116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65244 (or 65242 counting only the distinct ones).

The product of its digits is 144, while the sum is 19.

The square root of 221213116 is about 14873.2348868698. The cubic root of 221213116 is about 604.7886391432.

Adding to 221213116 its reverse (611312122), we get a palindrome (832525238).

The spelling of 221213116 in words is "two hundred twenty-one million, two hundred thirteen thousand, one hundred sixteen".