1211201121101 has 4 divisors (see below), whose sum is σ = 1211259957852. Its totient is φ = 1211142284352.

The previous prime is 1211201121041. The next prime is 1211201121133. The reversal of 1211201121101 is 1011211021121.

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 1149087522025 + 62113599076 = 1071955^2 + 249226^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211201121101 - 2³⁰ = 1210127379277 is a prime.

It is a super-3 number, since 3×1211201121101³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211201121601) 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, 29387486 + ... + 29428671.

It is an arithmetic number, because the mean of its divisors is an integer number (302814989463).

Almost surely, 2^{1211201121101} is an apocalyptic number.

It is an amenable number.

1211201121101 is a deficient number, since it is larger than the sum of its proper divisors (58836751).

1211201121101 is an equidigital number, since it uses as much as digits as its factorization.

1211201121101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58836750.

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

Adding to 1211201121101 its reverse (1011211021121), we get a palindrome (2222412142222).

The spelling of 1211201121101 in words is "one trillion, two hundred eleven billion, two hundred one million, one hundred twenty-one thousand, one hundred one".