211221120323123 has 4 divisors (see below), whose sum is σ = 211246590139728. Its totient is φ = 211195650506520.

The previous prime is 211221120323117. The next prime is 211221120323203. The reversal of 211221120323123 is 321323021122112.

211221120323123 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 not a de Polignac number, because 211221120323123 - 2⁸ = 211221120322867 is a prime.

It is a super-2 number, since 2×211221120323123² (a number of 29 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 = 211221120323092 and 211221120323101.

It is not an unprimeable number, because it can be changed into a prime (211221120323623) 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, 12734895863 + ... + 12734912448.

It is an arithmetic number, because the mean of its divisors is an integer number (52811647534932).

Almost surely, 2^{211221120323123} is an apocalyptic number.

211221120323123 is a deficient number, since it is larger than the sum of its proper divisors (25469816605).

211221120323123 is an equidigital number, since it uses as much as digits as its factorization.

211221120323123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25469816604.

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 211221120323123 its reverse (321323021122112), we get a palindrome (532544141445235).

The spelling of 211221120323123 in words is "two hundred eleven trillion, two hundred twenty-one billion, one hundred twenty million, three hundred twenty-three thousand, one hundred twenty-three".