1221001112 has 16 divisors (see below), whose sum is σ = 2294670840. Its totient is φ = 609088896.

The previous prime is 1221001097. The next prime is 1221001127. The reversal of 1221001112 is 2111001221.

It is an interprime number because it is at equal distance from previous prime (1221001097) and next prime (1221001127).

It is a junction number, because it is equal to n+sod(n) for n = 1221001093 and 1221001102.

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, 172778 + ... + 179705.

Almost surely, 2^1221001112 is an apocalyptic number.

It is an amenable number.

1221001112 is a deficient number, since it is larger than the sum of its proper divisors (1073669728).

1221001112 is a wasteful number, since it uses less digits than its factorization.

1221001112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352922 (or 352918 counting only the distinct ones).

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

The square root of 1221001112 is about 34942.8263310225. The cubic root of 1221001112 is about 1068.8219229005.

Adding to 1221001112 its reverse (2111001221), we get a palindrome (3332002333).

The spelling of 1221001112 in words is "one billion, two hundred twenty-one million, one thousand, one hundred twelve".