202023213221 has 8 divisors (see below), whose sum is σ = 205093201944. Its totient is φ = 198961401600.

The previous prime is 202023213121. The next prime is 202023213247. The reversal of 202023213221 is 122312320202.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 130963648321 + 71059564900 = 361889^2 + 266570^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202023213221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202023213193 and 202023213202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202023213121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1994480 + ... + 2093321.

It is an arithmetic number, because the mean of its divisors is an integer number (25636650243).

Almost surely, 2^202023213221 is an apocalyptic number.

It is an amenable number.

202023213221 is a deficient number, since it is larger than the sum of its proper divisors (3069988723).

202023213221 is an equidigital number, since it uses as much as digits as its factorization.

202023213221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4088551.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 202023213221 its reverse (122312320202), we get a palindrome (324335533423).

The spelling of 202023213221 in words is "two hundred two billion, twenty-three million, two hundred thirteen thousand, two hundred twenty-one".