202121321213 has 16 divisors (see below), whose sum is σ = 241053321216. Its totient is φ = 165704592240.

The previous prime is 202121321201. The next prime is 202121321231. The reversal of 202121321213 is 312123121202.

It is a cyclic number.

It is not a de Polignac number, because 202121321213 - 2⁴ = 202121321197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202121321293) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4194728 + ... + 4242638.

It is an arithmetic number, because the mean of its divisors is an integer number (15065832576).

Almost surely, 2^202121321213 is an apocalyptic number.

202121321213 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

202121321213 is a deficient number, since it is larger than the sum of its proper divisors (38932000003).

202121321213 is a wasteful number, since it uses less digits than its factorization.

202121321213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74144.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 202121321213 its reverse (312123121202), we get a palindrome (514244442415).

The spelling of 202121321213 in words is "two hundred two billion, one hundred twenty-one million, three hundred twenty-one thousand, two hundred thirteen".