1211221112 has 8 divisors (see below), whose sum is σ = 2271039600. Its totient is φ = 605610552.

The previous prime is 1211221111. The next prime is 1211221129. The reversal of 1211221112 is 2111221121.

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

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211221111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75701312 + ... + 75701327.

It is an arithmetic number, because the mean of its divisors is an integer number (283879950).

Almost surely, 2^1211221112 is an apocalyptic number.

It is an amenable number.

1211221112 is a deficient number, since it is larger than the sum of its proper divisors (1059818488).

1211221112 is a wasteful number, since it uses less digits than its factorization.

1211221112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151402645 (or 151402641 counting only the distinct ones).

The product of its digits is 16, while the sum is 14.

The square root of 1211221112 is about 34802.6020866256. The cubic root of 1211221112 is about 1065.9605789706.

Adding to 1211221112 its reverse (2111221121), we get a palindrome (3322442233).

Subtracting 1211221112 from its reverse (2111221121), we obtain a palindrome (900000009).

The spelling of 1211221112 in words is "one billion, two hundred eleven million, two hundred twenty-one thousand, one hundred twelve".