212021210321 has 4 divisors (see below), whose sum is σ = 212024796672. Its totient is φ = 212017623972.

The previous prime is 212021210309. The next prime is 212021210329. The reversal of 212021210321 is 123012120212.

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 a de Polignac number, because none of the positive numbers 2^k-212021210321 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 212021210321.

It is not an unprimeable number, because it can be changed into a prime (212021210329) 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, 1702985 + ... + 1823238.

It is an arithmetic number, because the mean of its divisors is an integer number (53006199168).

Almost surely, 2^212021210321 is an apocalyptic number.

It is an amenable number.

212021210321 is a deficient number, since it is larger than the sum of its proper divisors (3586351).

212021210321 is an equidigital number, since it uses as much as digits as its factorization.

212021210321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3586350.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 212021210321 its reverse (123012120212), we get a palindrome (335033330533).

The spelling of 212021210321 in words is "two hundred twelve billion, twenty-one million, two hundred ten thousand, three hundred twenty-one".