212011220123 has 4 divisors (see below), whose sum is σ = 215175566760. Its totient is φ = 208846873488.

The previous prime is 212011220117. The next prime is 212011220147. The reversal of 212011220123 is 321022110212.

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 212011220123 - 2⁴ = 212011220107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212011220723) 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, 1582173218 + ... + 1582173351.

It is an arithmetic number, because the mean of its divisors is an integer number (53793891690).

Almost surely, 2^212011220123 is an apocalyptic number.

212011220123 is a deficient number, since it is larger than the sum of its proper divisors (3164346637).

212011220123 is an equidigital number, since it uses as much as digits as its factorization.

212011220123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3164346636.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 212011220123 its reverse (321022110212), we get a palindrome (533033330335).

The spelling of 212011220123 in words is "two hundred twelve billion, eleven million, two hundred twenty thousand, one hundred twenty-three".