21120110121211 has 4 divisors (see below), whose sum is σ = 21120331743000. Its totient is φ = 21119888499424.

The previous prime is 21120110121203. The next prime is 21120110121239. The reversal of 21120110121211 is 11212101102112.

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 21120110121211 - 2³ = 21120110121203 is a prime.

It is a super-2 number, since 2×21120110121211² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120110121811) 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, 110667886 + ... + 110858563.

It is an arithmetic number, because the mean of its divisors is an integer number (5280082935750).

Almost surely, 2^{21120110121211} is an apocalyptic number.

21120110121211 is a deficient number, since it is larger than the sum of its proper divisors (221621789).

21120110121211 is an equidigital number, since it uses as much as digits as its factorization.

21120110121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221621788.

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

Adding to 21120110121211 its reverse (11212101102112), we get a palindrome (32332211223323).

The spelling of 21120110121211 in words is "twenty-one trillion, one hundred twenty billion, one hundred ten million, one hundred twenty-one thousand, two hundred eleven".