212020321 has 4 divisors (see below), whose sum is σ = 212236992. Its totient is φ = 211803652.

The previous prime is 212020301. The next prime is 212020349. The reversal of 212020321 is 123020212.

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 212020321 - 2¹¹ = 212018273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212020301) 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, 106861 + ... + 108826.

It is an arithmetic number, because the mean of its divisors is an integer number (53059248).

Almost surely, 2^212020321 is an apocalyptic number.

It is an amenable number.

212020321 is a deficient number, since it is larger than the sum of its proper divisors (216671).

212020321 is an equidigital number, since it uses as much as digits as its factorization.

212020321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216670.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 212020321 is about 14560.9175878445. The cubic root of 212020321 is about 596.2922468443.

Adding to 212020321 its reverse (123020212), we get a palindrome (335040533).

The spelling of 212020321 in words is "two hundred twelve million, twenty thousand, three hundred twenty-one".