221212120122011 has 4 divisors (see below), whose sum is σ = 222161528363112. Its totient is φ = 220262711880912.

The previous prime is 221212120122001. The next prime is 221212120122047. The reversal of 221212120122011 is 110221021212122.

221212120122011 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221212120122011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221212120122001) 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, 474704120201 + ... + 474704120666.

It is an arithmetic number, because the mean of its divisors is an integer number (55540382090778).

Almost surely, 2^{221212120122011} is an apocalyptic number.

221212120122011 is a deficient number, since it is larger than the sum of its proper divisors (949408241101).

221212120122011 is an equidigital number, since it uses as much as digits as its factorization.

221212120122011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 949408241100.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 221212120122011 its reverse (110221021212122), we get a palindrome (331433141334133).

The spelling of 221212120122011 in words is "two hundred twenty-one trillion, two hundred twelve billion, one hundred twenty million, one hundred twenty-two thousand, eleven".