20103232181 has 2 divisors, whose sum is σ = 20103232182. Its totient is φ = 20103232180.

The previous prime is 20103232111. The next prime is 20103232183. The reversal of 20103232181 is 18123230102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10641779281 + 9461452900 = 103159^2 + 97270^2 .

It is a cyclic number.

It is not a de Polignac number, because 20103232181 - 2¹⁰ = 20103231157 is a prime.

It is a super-2 number, since 2×20103232181² (a number of 21 digits) contains 22 as substring.

Together with 20103232183, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20103232183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10051616090 + 10051616091.

It is an arithmetic number, because the mean of its divisors is an integer number (10051616091).

Almost surely, 2^20103232181 is an apocalyptic number.

It is an amenable number.

20103232181 is a deficient number, since it is larger than the sum of its proper divisors (1).

20103232181 is an equidigital number, since it uses as much as digits as its factorization.

20103232181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 20103232181 its reverse (18123230102), we get a palindrome (38226462283).

The spelling of 20103232181 in words is "twenty billion, one hundred three million, two hundred thirty-two thousand, one hundred eighty-one".