20210231125181 has 2 divisors, whose sum is σ = 20210231125182. Its totient is φ = 20210231125180.

The previous prime is 20210231125127. The next prime is 20210231125199. The reversal of 20210231125181 is 18152113201202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10708634484025 + 9501596641156 = 3272405^2 + 3082466^2 .

It is a cyclic number.

It is not a de Polignac number, because 20210231125181 - 2²² = 20210226930877 is a prime.

It is a super-2 number, since 2×20210231125181² (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 (20210231125481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105115562590 + 10105115562591.

It is an arithmetic number, because the mean of its divisors is an integer number (10105115562591).

Almost surely, 2^{20210231125181} is an apocalyptic number.

It is an amenable number.

20210231125181 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210231125181 is an equidigital number, since it uses as much as digits as its factorization.

20210231125181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 29.

Adding to 20210231125181 its reverse (18152113201202), we get a palindrome (38362344326383).

The spelling of 20210231125181 in words is "twenty trillion, two hundred ten billion, two hundred thirty-one million, one hundred twenty-five thousand, one hundred eighty-one".