221031112 has 8 divisors (see below), whose sum is σ = 414433350. Its totient is φ = 110515552.

The previous prime is 221031101. The next prime is 221031119. The reversal of 221031112 is 211130122.

It can be written as a sum of positive squares in only one way, i.e., 207532836 + 13498276 = 14406^2 + 3674^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 221031092 and 221031101.

It is not an unprimeable number, because it can be changed into a prime (221031119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13814437 + ... + 13814452.

Almost surely, 2^221031112 is an apocalyptic number.

It is an amenable number.

221031112 is a deficient number, since it is larger than the sum of its proper divisors (193402238).

221031112 is a wasteful number, since it uses less digits than its factorization.

221031112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27628895 (or 27628891 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 221031112 is about 14867.1151202915. The cubic root of 221031112 is about 604.6227295215.

Adding to 221031112 its reverse (211130122), we get a palindrome (432161234).

The spelling of 221031112 in words is "two hundred twenty-one million, thirty-one thousand, one hundred twelve".