2112121121101 has 4 divisors (see below), whose sum is σ = 2116825177500. Its totient is φ = 2107417064704.

The previous prime is 2112121121069. The next prime is 2112121121129. The reversal of 2112121121101 is 1011211212112.

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 1541682306025 + 570438815076 = 1241645^2 + 755274^2 .

It is a cyclic number.

It is not a de Polignac number, because 2112121121101 - 2⁵ = 2112121121069 is a prime.

It is a super-2 number, since 2×2112121121101² (a number of 25 digits) contains 22 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 (2112121121191) 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, 2352027526 + ... + 2352028423.

It is an arithmetic number, because the mean of its divisors is an integer number (529206294375).

Almost surely, 2^{2112121121101} is an apocalyptic number.

It is an amenable number.

2112121121101 is a deficient number, since it is larger than the sum of its proper divisors (4704056399).

2112121121101 is an equidigital number, since it uses as much as digits as its factorization.

2112121121101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4704056398.

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

Adding to 2112121121101 its reverse (1011211212112), we get a palindrome (3123332333213).

The spelling of 2112121121101 in words is "two trillion, one hundred twelve billion, one hundred twenty-one million, one hundred twenty-one thousand, one hundred one".