2011221212101 has 4 divisors (see below), whose sum is σ = 2054013152832. Its totient is φ = 1968429271372.

The previous prime is 2011221212087. The next prime is 2011221212129. The reversal of 2011221212101 is 1012121221102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2011221212101 - 2¹³ = 2011221203909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011221212201) 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, 21395970295 + ... + 21395970388.

It is an arithmetic number, because the mean of its divisors is an integer number (513503288208).

Almost surely, 2^{2011221212101} is an apocalyptic number.

It is an amenable number.

2011221212101 is a deficient number, since it is larger than the sum of its proper divisors (42791940731).

2011221212101 is an equidigital number, since it uses as much as digits as its factorization.

2011221212101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42791940730.

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

Adding to 2011221212101 its reverse (1012121221102), we get a palindrome (3023342433203).

Subtracting from 2011221212101 its reverse (1012121221102), we obtain a palindrome (999099990999).

The spelling of 2011221212101 in words is "two trillion, eleven billion, two hundred twenty-one million, two hundred twelve thousand, one hundred one".