213233201021 has 4 divisors (see below), whose sum is σ = 218434010844. Its totient is φ = 208032391200.

The previous prime is 213233201011. The next prime is 213233201057. The reversal of 213233201021 is 120102332312.

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 82590712996 + 130642488025 = 287386^2 + 361445^2 .

It is a cyclic number.

It is not a de Polignac number, because 213233201021 - 2²⁶ = 213166092157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213233200984 and 213233201002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213233201011) 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, 2600404850 + ... + 2600404931.

It is an arithmetic number, because the mean of its divisors is an integer number (54608502711).

Almost surely, 2^213233201021 is an apocalyptic number.

It is an amenable number.

213233201021 is a deficient number, since it is larger than the sum of its proper divisors (5200809823).

213233201021 is an equidigital number, since it uses as much as digits as its factorization.

213233201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5200809822.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 213233201021 its reverse (120102332312), we get a palindrome (333335533333).

The spelling of 213233201021 in words is "two hundred thirteen billion, two hundred thirty-three million, two hundred one thousand, twenty-one".