1122122021 has 4 divisors (see below), whose sum is σ = 1122216492. Its totient is φ = 1122027552.

The previous prime is 1122122011. The next prime is 1122122041. The reversal of 1122122021 is 1202212211.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 912885796 + 209236225 = 30214^2 + 14465^2 .

It is a cyclic number.

It is not a de Polignac number, because 1122122021 - 2¹⁰ = 1122120997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1122121987 and 1122122005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1122122011) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 26336 + ... + 54201.

It is an arithmetic number, because the mean of its divisors is an integer number (280554123).

Almost surely, 2^1122122021 is an apocalyptic number.

It is an amenable number.

1122122021 is a deficient number, since it is larger than the sum of its proper divisors (94471).

1122122021 is an equidigital number, since it uses as much as digits as its factorization.

1122122021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94470.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 1122122021 is about 33498.0898112116. The cubic root of 1122122021 is about 1039.1542745377.

Adding to 1122122021 its reverse (1202212211), we get a palindrome (2324334232).

The spelling of 1122122021 in words is "one billion, one hundred twenty-two million, one hundred twenty-two thousand, twenty-one".