1211120012121 has 8 divisors (see below), whose sum is σ = 1625664446400. Its totient is φ = 801994459632.

The previous prime is 1211120012093. The next prime is 1211120012161. The reversal of 1211120012121 is 1212100211121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1211120012121 - 2¹⁰ = 1211120011097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1211120012121.

It is not an unprimeable number, because it can be changed into a prime (1211120012161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1354719925 + ... + 1354720818.

It is an arithmetic number, because the mean of its divisors is an integer number (203208055800).

Almost surely, 2^{1211120012121} is an apocalyptic number.

It is an amenable number.

1211120012121 is a deficient number, since it is larger than the sum of its proper divisors (414544434279).

1211120012121 is a wasteful number, since it uses less digits than its factorization.

1211120012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2709440895.

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

Adding to 1211120012121 its reverse (1212100211121), we get a palindrome (2423220223242).

The spelling of 1211120012121 in words is "one trillion, two hundred eleven billion, one hundred twenty million, twelve thousand, one hundred twenty-one".