211220110121 has 4 divisors (see below), whose sum is σ = 211311510144. Its totient is φ = 211128710100.

The previous prime is 211220110111. The next prime is 211220110139. The reversal of 211220110121 is 121011022112.

211220110121 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, 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 211220110121 - 2¹⁴ = 211220093737 is a prime.

It is a super-2 number, since 2×211220110121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211220110096 and 211220110105.

It is not an unprimeable number, because it can be changed into a prime (211220110111) 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, 45696545 + ... + 45701166.

It is an arithmetic number, because the mean of its divisors is an integer number (52827877536).

Almost surely, 2^211220110121 is an apocalyptic number.

It is an amenable number.

211220110121 is a deficient number, since it is larger than the sum of its proper divisors (91400023).

211220110121 is an equidigital number, since it uses as much as digits as its factorization.

211220110121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91400022.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 211220110121 its reverse (121011022112), we get a palindrome (332231132233).

The spelling of 211220110121 in words is "two hundred eleven billion, two hundred twenty million, one hundred ten thousand, one hundred twenty-one".