202120221181 has 2 divisors, whose sum is σ = 202120221182. Its totient is φ = 202120221180.

The previous prime is 202120221167. The next prime is 202120221263. The reversal of 202120221181 is 181122021202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143512168900 + 58608052281 = 378830^2 + 242091^2 .

It is a cyclic number.

It is not a de Polignac number, because 202120221181 - 2⁷ = 202120221053 is a prime.

It is a super-2 number, since 2×202120221181² (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 (202120227181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101060110590 + 101060110591.

It is an arithmetic number, because the mean of its divisors is an integer number (101060110591).

Almost surely, 2^202120221181 is an apocalyptic number.

It is an amenable number.

202120221181 is a deficient number, since it is larger than the sum of its proper divisors (1).

202120221181 is an equidigital number, since it uses as much as digits as its factorization.

202120221181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 202120221181 its reverse (181122021202), we get a palindrome (383242242383).

The spelling of 202120221181 in words is "two hundred two billion, one hundred twenty million, two hundred twenty-one thousand, one hundred eighty-one".