2130213312181 has 2 divisors, whose sum is σ = 2130213312182. Its totient is φ = 2130213312180.

The previous prime is 2130213312173. The next prime is 2130213312193. The reversal of 2130213312181 is 1812133120312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1279520683281 + 850692628900 = 1131159^2 + 922330^2 .

It is a cyclic number.

It is not a de Polignac number, because 2130213312181 - 2³ = 2130213312173 is a prime.

It is a super-2 number, since 2×2130213312181² (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 (2130213312121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065106656090 + 1065106656091.

It is an arithmetic number, because the mean of its divisors is an integer number (1065106656091).

Almost surely, 2^{2130213312181} is an apocalyptic number.

It is an amenable number.

2130213312181 is a deficient number, since it is larger than the sum of its proper divisors (1).

2130213312181 is an equidigital number, since it uses as much as digits as its factorization.

2130213312181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 28.

Adding to 2130213312181 its reverse (1812133120312), we get a palindrome (3942346432493).

The spelling of 2130213312181 in words is "two trillion, one hundred thirty billion, two hundred thirteen million, three hundred twelve thousand, one hundred eighty-one".