213113212123 has 12 divisors (see below), whose sum is σ = 248132026080. Its totient is φ = 182502810672.

The previous prime is 213113212027. The next prime is 213113212133. The reversal of 213113212123 is 321212311312.

It is a de Polignac number, because none of the positive numbers 2^k-213113212123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213113212094 and 213113212103.

It is not an unprimeable number, because it can be changed into a prime (213113212133) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1917508 + ... + 2025601.

It is an arithmetic number, because the mean of its divisors is an integer number (20677668840).

Almost surely, 2^213113212123 is an apocalyptic number.

213113212123 is a deficient number, since it is larger than the sum of its proper divisors (35018813957).

213113212123 is a wasteful number, since it uses less digits than its factorization.

213113212123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3944226 (or 3944219 counting only the distinct ones).

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

Adding to 213113212123 its reverse (321212311312), we get a palindrome (534325523435).

The spelling of 213113212123 in words is "two hundred thirteen billion, one hundred thirteen million, two hundred twelve thousand, one hundred twenty-three".