1112212021 has 4 divisors (see below), whose sum is σ = 1119296332. Its totient is φ = 1105127712.

The previous prime is 1112212019. The next prime is 1112212033. The reversal of 1112212021 is 1202122111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 193515921 + 918696100 = 13911^2 + 30310^2 .

It is a cyclic number.

It is not a de Polignac number, because 1112212021 - 2¹ = 1112212019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1112211992 and 1112212010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1112212001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3541920 + ... + 3542233.

It is an arithmetic number, because the mean of its divisors is an integer number (279824083).

Almost surely, 2^1112212021 is an apocalyptic number.

It is an amenable number.

1112212021 is a deficient number, since it is larger than the sum of its proper divisors (7084311).

1112212021 is an equidigital number, since it uses as much as digits as its factorization.

1112212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7084310.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1112212021 is about 33349.8428931832. The cubic root of 1112212021 is about 1036.0861340335.

Adding to 1112212021 its reverse (1202122111), we get a palindrome (2314334132).

The spelling of 1112212021 in words is "one billion, one hundred twelve million, two hundred twelve thousand, twenty-one".