212023215021 has 4 divisors (see below), whose sum is σ = 282697620032. Its totient is φ = 141348810012.

The previous prime is 212023215011. The next prime is 212023215037. The reversal of 212023215021 is 120512320212.

212023215021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 212023215021 - 2⁹ = 212023214509 is a prime.

It is a super-3 number, since 3×212023215021³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212023215011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35337202501 + ... + 35337202506.

It is an arithmetic number, because the mean of its divisors is an integer number (70674405008).

Almost surely, 2^212023215021 is an apocalyptic number.

It is an amenable number.

212023215021 is a deficient number, since it is larger than the sum of its proper divisors (70674405011).

212023215021 is an equidigital number, since it uses as much as digits as its factorization.

212023215021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70674405010.

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 212023215021 its reverse (120512320212), we get a palindrome (332535535233).

The spelling of 212023215021 in words is "two hundred twelve billion, twenty-three million, two hundred fifteen thousand, twenty-one".