202011312221 has 4 divisors (see below), whose sum is σ = 202025931744. Its totient is φ = 201996692700.

The previous prime is 202011312169. The next prime is 202011312247. The reversal of 202011312221 is 122213110202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 202011312221 - 2³⁰ = 200937570397 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 202011312221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202011315221) 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, 7289015 + ... + 7316676.

It is an arithmetic number, because the mean of its divisors is an integer number (50506482936).

Almost surely, 2^202011312221 is an apocalyptic number.

It is an amenable number.

202011312221 is a deficient number, since it is larger than the sum of its proper divisors (14619523).

202011312221 is a wasteful number, since it uses less digits than its factorization.

202011312221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14619522.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 202011312221 its reverse (122213110202), we get a palindrome (324224422423).

The spelling of 202011312221 in words is "two hundred two billion, eleven million, three hundred twelve thousand, two hundred twenty-one".