212131213321 has 4 divisors (see below), whose sum is σ = 212563252944. Its totient is φ = 211699173700.

The previous prime is 212131213303. The next prime is 212131213361. The reversal of 212131213321 is 123312131212.

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 212131213321 - 2⁹ = 212131212809 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212131213292 and 212131213301.

It is not an unprimeable number, because it can be changed into a prime (212131213361) 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, 216019075 + ... + 216020056.

It is an arithmetic number, because the mean of its divisors is an integer number (53140813236).

Almost surely, 2^212131213321 is an apocalyptic number.

It is an amenable number.

212131213321 is a deficient number, since it is larger than the sum of its proper divisors (432039623).

212131213321 is an equidigital number, since it uses as much as digits as its factorization.

212131213321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432039622.

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

Adding to 212131213321 its reverse (123312131212), we get a palindrome (335443344533).

The spelling of 212131213321 in words is "two hundred twelve billion, one hundred thirty-one million, two hundred thirteen thousand, three hundred twenty-one".