1021211120121 has 16 divisors (see below), whose sum is σ = 1362391695360. Its totient is φ = 680419086480.

The previous prime is 1021211120117. The next prime is 1021211120141. The reversal of 1021211120121 is 1210211121201.

It is a happy number.

It is not a de Polignac number, because 1021211120121 - 2² = 1021211120117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1021211120121.

It is not an unprimeable number, because it can be changed into a prime (1021211120101) 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 15 ways as a sum of consecutive naturals, for example, 63567336 + ... + 63583398.

It is an arithmetic number, because the mean of its divisors is an integer number (85149480960).

Almost surely, 2^{1021211120121} is an apocalyptic number.

It is an amenable number.

1021211120121 is a deficient number, since it is larger than the sum of its proper divisors (341180575239).

1021211120121 is a wasteful number, since it uses less digits than its factorization.

1021211120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26836.

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

Adding to 1021211120121 its reverse (1210211121201), we get a palindrome (2231422241322).

The spelling of 1021211120121 in words is "one trillion, twenty-one billion, two hundred eleven million, one hundred twenty thousand, one hundred twenty-one".