221102012 has 24 divisors (see below), whose sum is σ = 417233040. Its totient is φ = 102176640.

The previous prime is 221101981. The next prime is 221102027. The reversal of 221102012 is 210201122.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 221101984 and 221102002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32363 + ... + 38594.

It is an arithmetic number, because the mean of its divisors is an integer number (17384710).

Almost surely, 2^221102012 is an apocalyptic number.

It is an amenable number.

221102012 is a deficient number, since it is larger than the sum of its proper divisors (196131028).

221102012 is a wasteful number, since it uses less digits than its factorization.

221102012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71021 (or 71019 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 221102012 is about 14869.4993863277. The cubic root of 221102012 is about 604.6873707514.

Adding to 221102012 its reverse (210201122), we get a palindrome (431303134).

The spelling of 221102012 in words is "two hundred twenty-one million, one hundred two thousand, twelve".