2101212122011 has 4 divisors (see below), whose sum is σ = 2101522087800. Its totient is φ = 2100902156224.

The previous prime is 2101212121991. The next prime is 2101212122029. The reversal of 2101212122011 is 1102212121012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2101212122011 - 2⁹ = 2101212121499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2101212122311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154972726 + ... + 154986283.

It is an arithmetic number, because the mean of its divisors is an integer number (525380521950).

Almost surely, 2^{2101212122011} is an apocalyptic number.

2101212122011 is a deficient number, since it is larger than the sum of its proper divisors (309965789).

2101212122011 is an equidigital number, since it uses as much as digits as its factorization.

2101212122011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309965788.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 2101212122011 its reverse (1102212121012), we get a palindrome (3203424243023).

Subtracting from 2101212122011 its reverse (1102212121012), we obtain a palindrome (999000000999).

The spelling of 2101212122011 in words is "two trillion, one hundred one billion, two hundred twelve million, one hundred twenty-two thousand, eleven".