1021222112121 has 12 divisors (see below), whose sum is σ = 1489703544420. Its totient is φ = 674074000800.

The previous prime is 1021222112117. The next prime is 1021222112179. The reversal of 1021222112121 is 1212112221201.

It can be written as a sum of positive squares in 2 ways, for example, as 450194031225 + 571028080896 = 670965^2 + 755664^2 .

It is not a de Polignac number, because 1021222112121 - 2² = 1021222112117 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1021222112094 and 1021222112103.

It is not an unprimeable number, because it can be changed into a prime (1021222112191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 561727426 + ... + 561729243.

It is an arithmetic number, because the mean of its divisors is an integer number (124141962035).

Almost surely, 2^{1021222112121} is an apocalyptic number.

It is an amenable number.

1021222112121 is a deficient number, since it is larger than the sum of its proper divisors (468481432299).

1021222112121 is a wasteful number, since it uses less digits than its factorization.

1021222112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1123456776 (or 1123456773 counting only the distinct ones).

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

Adding to 1021222112121 its reverse (1212112221201), we get a palindrome (2233334333322).

The spelling of 1021222112121 in words is "one trillion, twenty-one billion, two hundred twenty-two million, one hundred twelve thousand, one hundred twenty-one".