213233242021 has 4 divisors (see below), whose sum is σ = 218434052844. Its totient is φ = 208032431200.

The previous prime is 213233242007. The next prime is 213233242031. The reversal of 213233242021 is 120242332312.

213233242021 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.

It can be written as a sum of positive squares in 2 ways, for example, as 71669179521 + 141564062500 = 267711^2 + 376250^2 .

It is a cyclic number.

It is not a de Polignac number, because 213233242021 - 2⁹ = 213233241509 is a prime.

It is a super-3 number, since 3×213233242021³ (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 (213233242031) 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, 2600405350 + ... + 2600405431.

It is an arithmetic number, because the mean of its divisors is an integer number (54608513211).

Almost surely, 2^213233242021 is an apocalyptic number.

It is an amenable number.

213233242021 is a deficient number, since it is larger than the sum of its proper divisors (5200810823).

213233242021 is an equidigital number, since it uses as much as digits as its factorization.

213233242021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5200810822.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 213233242021 its reverse (120242332312), we get a palindrome (333475574333).

The spelling of 213233242021 in words is "two hundred thirteen billion, two hundred thirty-three million, two hundred forty-two thousand, twenty-one".