20124192181 has 2 divisors, whose sum is σ = 20124192182. Its totient is φ = 20124192180.

The previous prime is 20124192139. The next prime is 20124192211. The reversal of 20124192181 is 18129142102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17724661956 + 2399530225 = 133134^2 + 48985^2 .

It is a cyclic number.

It is not a de Polignac number, because 20124192181 - 2²⁷ = 19989974453 is a prime.

It is a super-2 number, since 2×20124192181² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20124196181) 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, 10062096090 + 10062096091.

It is an arithmetic number, because the mean of its divisors is an integer number (10062096091).

Almost surely, 2^20124192181 is an apocalyptic number.

It is an amenable number.

20124192181 is a deficient number, since it is larger than the sum of its proper divisors (1).

20124192181 is an equidigital number, since it uses as much as digits as its factorization.

20124192181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 31.

The spelling of 20124192181 in words is "twenty billion, one hundred twenty-four million, one hundred ninety-two thousand, one hundred eighty-one".