1211121121101 has 16 divisors (see below), whose sum is σ = 1668646866624. Its totient is φ = 780772483584.

The previous prime is 1211121121061. The next prime is 1211121121121. The reversal of 1211121121101 is 1011211211121.

It is not a de Polignac number, because 1211121121101 - 2⁶ = 1211121121037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211121121121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33451236 + ... + 33487421.

It is an arithmetic number, because the mean of its divisors is an integer number (104290429164).

Almost surely, 2^{1211121121101} is an apocalyptic number.

It is an amenable number.

1211121121101 is a deficient number, since it is larger than the sum of its proper divisors (457525745523).

1211121121101 is a wasteful number, since it uses less digits than its factorization.

1211121121101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66938860.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 1211121121101 its reverse (1011211211121), we get a palindrome (2222332332222).

The spelling of 1211121121101 in words is "one trillion, two hundred eleven billion, one hundred twenty-one million, one hundred twenty-one thousand, one hundred one".