221111012 has 6 divisors (see below), whose sum is σ = 386944278. Its totient is φ = 110555504.

The previous prime is 221110997. The next prime is 221111021. The reversal of 221111012 is 210111122.

221111012 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 219217636 + 1893376 = 14806^2 + 1376^2 .

It is a junction number, because it is equal to n+sod(n) for n = 221110984 and 221111002.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27638873 + ... + 27638880.

It is an arithmetic number, because the mean of its divisors is an integer number (64490713).

Almost surely, 2^221111012 is an apocalyptic number.

It is an amenable number.

221111012 is a deficient number, since it is larger than the sum of its proper divisors (165833266).

221111012 is a wasteful number, since it uses less digits than its factorization.

221111012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55277757 (or 55277755 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 221111012 is about 14869.8020161669. The cubic root of 221111012 is about 604.6955752787.

Adding to 221111012 its reverse (210111122), we get a palindrome (431222134).

It can be divided in two parts, 2211110 and 12, that added together give a palindrome (2211122).

The spelling of 221111012 in words is "two hundred twenty-one million, one hundred eleven thousand, twelve".