20031122129 has 2 divisors, whose sum is σ = 20031122130. Its totient is φ = 20031122128.

The previous prime is 20031122101. The next prime is 20031122141. The reversal of 20031122129 is 92122113002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15152379025 + 4878743104 = 123095^2 + 69848^2 .

It is a cyclic number.

It is not a de Polignac number, because 20031122129 - 2²⁴ = 20014344913 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20031122149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10015561064 + 10015561065.

It is an arithmetic number, because the mean of its divisors is an integer number (10015561065).

Almost surely, 2^20031122129 is an apocalyptic number.

It is an amenable number.

20031122129 is a deficient number, since it is larger than the sum of its proper divisors (1).

20031122129 is an equidigital number, since it uses as much as digits as its factorization.

20031122129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The spelling of 20031122129 in words is "twenty billion, thirty-one million, one hundred twenty-two thousand, one hundred twenty-nine".