20012111129 has 2 divisors, whose sum is σ = 20012111130. Its totient is φ = 20012111128.

The previous prime is 20012111099. The next prime is 20012111173. The reversal of 20012111129 is 92111121002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18617238025 + 1394873104 = 136445^2 + 37348^2 .

It is a cyclic number.

It is not a de Polignac number, because 20012111129 - 2²⁴ = 19995333913 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20012111129.

It is not a weakly prime, because it can be changed into another prime (20012111729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006055564 + 10006055565.

It is an arithmetic number, because the mean of its divisors is an integer number (10006055565).

Almost surely, 2^20012111129 is an apocalyptic number.

It is an amenable number.

20012111129 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012111129 is an equidigital number, since it uses as much as digits as its factorization.

20012111129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 20012111129 in words is "twenty billion, twelve million, one hundred eleven thousand, one hundred twenty-nine".