212124203321 has 4 divisors (see below), whose sum is σ = 224602097652. Its totient is φ = 199646308992.

The previous prime is 212124203303. The next prime is 212124203323. The reversal of 212124203321 is 123302421212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 115984519225 + 96139684096 = 340565^2 + 310064^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212124203321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212124203323) 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, 6238947140 + ... + 6238947173.

It is an arithmetic number, because the mean of its divisors is an integer number (56150524413).

Almost surely, 2^212124203321 is an apocalyptic number.

It is an amenable number.

212124203321 is a deficient number, since it is larger than the sum of its proper divisors (12477894331).

212124203321 is a wasteful number, since it uses less digits than its factorization.

212124203321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12477894330.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 212124203321 its reverse (123302421212), we get a palindrome (335426624533).

The spelling of 212124203321 in words is "two hundred twelve billion, one hundred twenty-four million, two hundred three thousand, three hundred twenty-one".