2120210220181 has 2 divisors, whose sum is σ = 2120210220182. Its totient is φ = 2120210220180.

The previous prime is 2120210220083. The next prime is 2120210220197. The reversal of 2120210220181 is 1810220120212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1493183797681 + 627026422500 = 1221959^2 + 791850^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120210220181 - 2¹⁵ = 2120210187413 is a prime.

It is a super-2 number, since 2×2120210220181² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2120210220881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060105110090 + 1060105110091.

It is an arithmetic number, because the mean of its divisors is an integer number (1060105110091).

Almost surely, 2^{2120210220181} is an apocalyptic number.

It is an amenable number.

2120210220181 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120210220181 is an equidigital number, since it uses as much as digits as its factorization.

2120210220181 is an odious number, because the sum of its binary digits is odd.

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

Adding to 2120210220181 its reverse (1810220120212), we get a palindrome (3930430340393).

The spelling of 2120210220181 in words is "two trillion, one hundred twenty billion, two hundred ten million, two hundred twenty thousand, one hundred eighty-one".