1011211121201 has 4 divisors (see below), whose sum is σ = 1030290576372. Its totient is φ = 992131666032.

The previous prime is 1011211121191. The next prime is 1011211121209. The reversal of 1011211121201 is 1021211121101.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 567308733601 + 443902387600 = 753199^2 + 666260^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1011211121201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1011211121209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9539727506 + ... + 9539727611.

It is an arithmetic number, because the mean of its divisors is an integer number (257572644093).

Almost surely, 2^{1011211121201} is an apocalyptic number.

It is an amenable number.

1011211121201 is a deficient number, since it is larger than the sum of its proper divisors (19079455171).

1011211121201 is an equidigital number, since it uses as much as digits as its factorization.

1011211121201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19079455170.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 1011211121201 its reverse (1021211121101), we get a palindrome (2032422242302).

The spelling of 1011211121201 in words is "one trillion, eleven billion, two hundred eleven million, one hundred twenty-one thousand, two hundred one".