212213032021 has 4 divisors (see below), whose sum is σ = 212731890700. Its totient is φ = 211694173344.

The previous prime is 212213032007. The next prime is 212213032043. The reversal of 212213032021 is 120230312212.

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 189585351396 + 22627680625 = 435414^2 + 150425^2 .

It is a cyclic number.

It is not a de Polignac number, because 212213032021 - 2⁷ = 212213031893 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 212213032021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212213032001) 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, 259428726 + ... + 259429543.

It is an arithmetic number, because the mean of its divisors is an integer number (53182972675).

Almost surely, 2^212213032021 is an apocalyptic number.

It is an amenable number.

212213032021 is a deficient number, since it is larger than the sum of its proper divisors (518858679).

212213032021 is an equidigital number, since it uses as much as digits as its factorization.

212213032021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518858678.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 212213032021 its reverse (120230312212), we get a palindrome (332443344233).

The spelling of 212213032021 in words is "two hundred twelve billion, two hundred thirteen million, thirty-two thousand, twenty-one".