1021121012121 has 24 divisors (see below), whose sum is σ = 1583850974400. Its totient is φ = 583471399392.

The previous prime is 1021121012117. The next prime is 1021121012129. The reversal of 1021121012121 is 1212101211201.

It is a happy number.

It is not a de Polignac number, because 1021121012121 - 2² = 1021121012117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1021121012121.

It is not an unprimeable number, because it can be changed into a prime (1021121012129) 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 23 ways as a sum of consecutive naturals, for example, 3384355 + ... + 3673703.

It is an arithmetic number, because the mean of its divisors is an integer number (65993790600).

Almost surely, 2^{1021121012121} is an apocalyptic number.

It is an amenable number.

1021121012121 is a deficient number, since it is larger than the sum of its proper divisors (562729962279).

1021121012121 is a wasteful number, since it uses less digits than its factorization.

1021121012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313373 (or 313366 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1021121012121 its reverse (1212101211201), we get a palindrome (2233222223322).

The spelling of 1021121012121 in words is "one trillion, twenty-one billion, one hundred twenty-one million, twelve thousand, one hundred twenty-one".