212021112123 has 6 divisors (see below), whose sum is σ = 306252717524. Its totient is φ = 141347408076.

The previous prime is 212021112109. The next prime is 212021112133. The reversal of 212021112123 is 321211120212.

It is not a de Polignac number, because 212021112123 - 2²⁶ = 211954003259 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212021112096 and 212021112105.

It is not an unprimeable number, because it can be changed into a prime (212021112133) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11778950665 + ... + 11778950682.

Almost surely, 2^212021112123 is an apocalyptic number.

212021112123 is a deficient number, since it is larger than the sum of its proper divisors (94231605401).

212021112123 is a wasteful number, since it uses less digits than its factorization.

212021112123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23557901353 (or 23557901350 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 212021112123 its reverse (321211120212), we get a palindrome (533232232335).

The spelling of 212021112123 in words is "two hundred twelve billion, twenty-one million, one hundred twelve thousand, one hundred twenty-three".