1211021112 has 64 divisors (see below), whose sum is σ = 3663601920. Its totient is φ = 325651968.

The previous prime is 1211021111. The next prime is 1211021117. The reversal of 1211021112 is 2111201121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211021111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 209158 + ... + 214869.

It is an arithmetic number, because the mean of its divisors is an integer number (57243780).

Almost surely, 2^1211021112 is an apocalyptic number.

1211021112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1211021112 is an abundant number, since it is smaller than the sum of its proper divisors (2452580808).

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

1211021112 is a wasteful number, since it uses less digits than its factorization.

1211021112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424060 (or 424056 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

The square root of 1211021112 is about 34799.7286196315. The cubic root of 1211021112 is about 1065.9019043408.

Adding to 1211021112 its reverse (2111201121), we get a palindrome (3322222233).

Subtracting 1211021112 from its reverse (2111201121), we obtain a square (900180009 = 30003²).

The spelling of 1211021112 in words is "one billion, two hundred eleven million, twenty-one thousand, one hundred twelve".