2121112112101 has 4 divisors (see below), whose sum is σ = 2194253909100. Its totient is φ = 2047970315104.

The previous prime is 2121112112083. The next prime is 2121112112113. The reversal of 2121112112101 is 1012112111212.

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 1395209816100 + 725902296001 = 1181190^2 + 851999^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121112112101 - 2⁹ = 2121112111589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121112118101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36570898456 + ... + 36570898513.

It is an arithmetic number, because the mean of its divisors is an integer number (548563477275).

Almost surely, 2^{2121112112101} is an apocalyptic number.

It is an amenable number.

2121112112101 is a deficient number, since it is larger than the sum of its proper divisors (73141796999).

2121112112101 is an equidigital number, since it uses as much as digits as its factorization.

2121112112101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73141796998.

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

Adding to 2121112112101 its reverse (1012112111212), we get a palindrome (3133224223313).

The spelling of 2121112112101 in words is "two trillion, one hundred twenty-one billion, one hundred twelve million, one hundred twelve thousand, one hundred one".