211212121222123 has 8 divisors (see below), whose sum is σ = 241385448058880. Its totient is φ = 181038836050920.

The previous prime is 211212121222121. The next prime is 211212121222129. The reversal of 211212121222123 is 321222121212112.

211212121222123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211212121222123 - 2¹ = 211212121222121 is a prime.

It is a super-2 number, since 2×211212121222123² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211212121222121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1329208 + ... + 20595898.

It is an arithmetic number, because the mean of its divisors is an integer number (30173181007360).

Almost surely, 2^{211212121222123} is an apocalyptic number.

211212121222123 is a deficient number, since it is larger than the sum of its proper divisors (30173326836757).

211212121222123 is a wasteful number, since it uses less digits than its factorization.

211212121222123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20832777.

The product of its digits is 768, while the sum is 25.

Adding to 211212121222123 its reverse (321222121212112), we get a palindrome (532434242434235).

The spelling of 211212121222123 in words is "two hundred eleven trillion, two hundred twelve billion, one hundred twenty-one million, two hundred twenty-two thousand, one hundred twenty-three".