213102212123 has 4 divisors (see below), whose sum is σ = 214057827648. Its totient is φ = 212146596600.

The previous prime is 213102212111. The next prime is 213102212137. The reversal of 213102212123 is 321212201312.

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 213102212123 - 2¹⁰ = 213102211099 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213102212095 and 213102212104.

It is not an unprimeable number, because it can be changed into a prime (213102212723) 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, 477807428 + ... + 477807873.

It is an arithmetic number, because the mean of its divisors is an integer number (53514456912).

Almost surely, 2^213102212123 is an apocalyptic number.

213102212123 is a deficient number, since it is larger than the sum of its proper divisors (955615525).

213102212123 is an equidigital number, since it uses as much as digits as its factorization.

213102212123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 955615524.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 213102212123 its reverse (321212201312), we get a palindrome (534314413435).

The spelling of 213102212123 in words is "two hundred thirteen billion, one hundred two million, two hundred twelve thousand, one hundred twenty-three".