20012138129 has 2 divisors, whose sum is σ = 20012138130. Its totient is φ = 20012138128.

The previous prime is 20012138099. The next prime is 20012138177. The reversal of 20012138129 is 92183121002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18074113600 + 1938024529 = 134440^2 + 44023^2 .

It is a cyclic number.

It is not a de Polignac number, because 20012138129 - 2¹² = 20012134033 is a prime.

It is not a weakly prime, because it can be changed into another prime (20012138329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006069064 + 10006069065.

It is an arithmetic number, because the mean of its divisors is an integer number (10006069065).

Almost surely, 2^20012138129 is an apocalyptic number.

It is an amenable number.

20012138129 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012138129 is an equidigital number, since it uses as much as digits as its factorization.

20012138129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 29.

The spelling of 20012138129 in words is "twenty billion, twelve million, one hundred thirty-eight thousand, one hundred twenty-nine".