202013220181 has 2 divisors, whose sum is σ = 202013220182. Its totient is φ = 202013220180.

The previous prime is 202013220169. The next prime is 202013220197. The reversal of 202013220181 is 181022310202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 166165477956 + 35847742225 = 407634^2 + 189335^2 .

It is a cyclic number.

It is not a de Polignac number, because 202013220181 - 2¹¹ = 202013218133 is a prime.

It is a super-2 number, since 2×202013220181² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202013220481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101006610090 + 101006610091.

It is an arithmetic number, because the mean of its divisors is an integer number (101006610091).

Almost surely, 2^202013220181 is an apocalyptic number.

It is an amenable number.

202013220181 is a deficient number, since it is larger than the sum of its proper divisors (1).

202013220181 is an equidigital number, since it uses as much as digits as its factorization.

202013220181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 202013220181 its reverse (181022310202), we get a palindrome (383035530383).

The spelling of 202013220181 in words is "two hundred two billion, thirteen million, two hundred twenty thousand, one hundred eighty-one".