21050130123181 has 2 divisors, whose sum is σ = 21050130123182. Its totient is φ = 21050130123180.

The previous prime is 21050130123137. The next prime is 21050130123193. The reversal of 21050130123181 is 18132103105012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18897061055625 + 2153069067556 = 4347075^2 + 1467334^2 .

It is a cyclic number.

It is not a de Polignac number, because 21050130123181 - 2⁷ = 21050130123053 is a prime.

It is a super-2 number, since 2×21050130123181² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21050130123131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10525065061590 + 10525065061591.

It is an arithmetic number, because the mean of its divisors is an integer number (10525065061591).

Almost surely, 2^{21050130123181} is an apocalyptic number.

It is an amenable number.

21050130123181 is a deficient number, since it is larger than the sum of its proper divisors (1).

21050130123181 is an equidigital number, since it uses as much as digits as its factorization.

21050130123181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 28.

Adding to 21050130123181 its reverse (18132103105012), we get a palindrome (39182233228193).

The spelling of 21050130123181 in words is "twenty-one trillion, fifty billion, one hundred thirty million, one hundred twenty-three thousand, one hundred eighty-one".