213123100001 has 4 divisors (see below), whose sum is σ = 243569257152. Its totient is φ = 182676942852.

The previous prime is 213123099991. The next prime is 213123100007. The reversal of 213123100001 is 100001321312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 213123100001 - 2³⁰ = 212049358177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213123100007) 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, 15223078565 + ... + 15223078578.

It is an arithmetic number, because the mean of its divisors is an integer number (60892314288).

Almost surely, 2^213123100001 is an apocalyptic number.

It is an amenable number.

213123100001 is a deficient number, since it is larger than the sum of its proper divisors (30446157151).

213123100001 is an equidigital number, since it uses as much as digits as its factorization.

213123100001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30446157150.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 213123100001 its reverse (100001321312), we get a palindrome (313124421313).

The spelling of 213123100001 in words is "two hundred thirteen billion, one hundred twenty-three million, one hundred thousand, one".