212111021321 has 8 divisors (see below), whose sum is σ = 219545614080. Its totient is φ = 204684456592.

The previous prime is 212111021299. The next prime is 212111021327. The reversal of 212111021321 is 123120111212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212111021321 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212111021321.

It is not an unprimeable number, because it can be changed into a prime (212111021327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1953215 + ... + 2058948.

It is an arithmetic number, because the mean of its divisors is an integer number (27443201760).

Almost surely, 2^212111021321 is an apocalyptic number.

It is an amenable number.

212111021321 is a deficient number, since it is larger than the sum of its proper divisors (7434592759).

212111021321 is a wasteful number, since it uses less digits than its factorization.

212111021321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4014015.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 212111021321 its reverse (123120111212), we get a palindrome (335231132533).

The spelling of 212111021321 in words is "two hundred twelve billion, one hundred eleven million, twenty-one thousand, three hundred twenty-one".