1221112122 has 16 divisors (see below), whose sum is σ = 2444751072. Its totient is φ = 406616240.

The previous prime is 1221112117. The next prime is 1221112133. The reversal of 1221112122 is 2212111221.

It is a super-2 number, since 2×1221112122² = 2982229628990685768, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 98973 + ... + 110624.

It is an arithmetic number, because the mean of its divisors is an integer number (152796942).

Almost surely, 2^1221112122 is an apocalyptic number.

1221112122 is an abundant number, since it is smaller than the sum of its proper divisors (1223638950).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221112122 is a wasteful number, since it uses less digits than its factorization.

1221112122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210573.

The product of its digits is 32, while the sum is 15.

The square root of 1221112122 is about 34944.4147468519. The cubic root of 1221112122 is about 1068.8543133504.

Adding to 1221112122 its reverse (2212111221), we get a palindrome (3433223343).

Subtracting 1221112122 from its reverse (2212111221), we obtain a palindrome (990999099).

The spelling of 1221112122 in words is "one billion, two hundred twenty-one million, one hundred twelve thousand, one hundred twenty-two".