1121121222021 has 20 divisors (see below), whose sum is σ = 1674809885452. Its totient is φ = 747392479488.

The previous prime is 1121121221993. The next prime is 1121121222101. The reversal of 1121121222021 is 1202221211211.

1121121222021 is a `hidden beast` number, since 1 + 1 + 211 + 212 + 220 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 895220637921 + 225900584100 = 946161^2 + 475290^2 .

It is not a de Polignac number, because 1121121222021 - 2¹⁰ = 1121121220997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1121121221985 and 1121121222003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121121222421) 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 19 ways as a sum of consecutive naturals, for example, 2905575 + ... + 3268731.

Almost surely, 2^{1121121222021} is an apocalyptic number.

It is an amenable number.

1121121222021 is a deficient number, since it is larger than the sum of its proper divisors (553688663431).

1121121222021 is an equidigital number, since it uses as much as digits as its factorization.

1121121222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401282 (or 401273 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1121121222021 its reverse (1202221211211), we get a palindrome (2323342433232).

The spelling of 1121121222021 in words is "one trillion, one hundred twenty-one billion, one hundred twenty-one million, two hundred twenty-two thousand, twenty-one".