213131212123 has 8 divisors (see below), whose sum is σ = 224363144720. Its totient is φ = 201900729600.

The previous prime is 213131212111. The next prime is 213131212139. The reversal of 213131212123 is 321212131312.

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 213131212123 - 2²⁵ = 213097657691 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213131212094 and 213131212103.

It is not an unprimeable number, because it can be changed into a prime (213131212103) 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, 54078 + ... + 655123.

It is an arithmetic number, because the mean of its divisors is an integer number (28045393090).

Almost surely, 2^213131212123 is an apocalyptic number.

213131212123 is a deficient number, since it is larger than the sum of its proper divisors (11231932597).

213131212123 is a wasteful number, since it uses less digits than its factorization.

213131212123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725037.

The product of its digits is 432, while the sum is 22.

Adding to 213131212123 its reverse (321212131312), we get a palindrome (534343343435).

The spelling of 213131212123 in words is "two hundred thirteen billion, one hundred thirty-one million, two hundred twelve thousand, one hundred twenty-three".