1211101102121 has 4 divisors (see below), whose sum is σ = 1223092202244. Its totient is φ = 1199110002000.

The previous prime is 1211101102109. The next prime is 1211101102153. The reversal of 1211101102121 is 1212011011121.

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 1096074988096 + 115026114025 = 1046936^2 + 339155^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211101102121 - 2³⁸ = 936223195177 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211101102096 and 1211101102105.

It is not an unprimeable number, because it can be changed into a prime (1211101102171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5995549910 + ... + 5995550111.

It is an arithmetic number, because the mean of its divisors is an integer number (305773050561).

Almost surely, 2^{1211101102121} is an apocalyptic number.

It is an amenable number.

1211101102121 is a deficient number, since it is larger than the sum of its proper divisors (11991100123).

1211101102121 is a wasteful number, since it uses less digits than its factorization.

1211101102121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11991100122.

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

Adding to 1211101102121 its reverse (1212011011121), we get a palindrome (2423112113242).

The spelling of 1211101102121 in words is "one trillion, two hundred eleven billion, one hundred one million, one hundred two thousand, one hundred twenty-one".