213120023123 has 6 divisors (see below), whose sum is σ = 247915128996. Its totient is φ = 182674305492.

The previous prime is 213120023111. The next prime is 213120023143. The reversal of 213120023123 is 321320021312.

It is not a de Polignac number, because 213120023123 - 2¹⁴ = 213120006739 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213120023095 and 213120023104.

It is not an unprimeable number, because it can be changed into a prime (213120023143) 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, 2174694065 + ... + 2174694162.

It is an arithmetic number, because the mean of its divisors is an integer number (41319188166).

Almost surely, 2^213120023123 is an apocalyptic number.

213120023123 is a deficient number, since it is larger than the sum of its proper divisors (34795105873).

213120023123 is an equidigital number, since it uses as much as digits as its factorization.

213120023123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4349388241 (or 4349388234 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 213120023123 its reverse (321320021312), we get a palindrome (534440044435).

The spelling of 213120023123 in words is "two hundred thirteen billion, one hundred twenty million, twenty-three thousand, one hundred twenty-three".