20210123332181 has 2 divisors, whose sum is σ = 20210123332182. Its totient is φ = 20210123332180.

The previous prime is 20210123332043. The next prime is 20210123332219. The reversal of 20210123332181 is 18123332101202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16231430880625 + 3978692451556 = 4028825^2 + 1994666^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20210123332181 is a prime.

It is a super-2 number, since 2×20210123332181² (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 (20210123332481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105061666090 + 10105061666091.

It is an arithmetic number, because the mean of its divisors is an integer number (10105061666091).

Almost surely, 2^{20210123332181} is an apocalyptic number.

It is an amenable number.

20210123332181 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210123332181 is an equidigital number, since it uses as much as digits as its factorization.

20210123332181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 29.

Adding to 20210123332181 its reverse (18123332101202), we get a palindrome (38333455433383).

The spelling of 20210123332181 in words is "twenty trillion, two hundred ten billion, one hundred twenty-three million, three hundred thirty-two thousand, one hundred eighty-one".