20102129 has 2 divisors, whose sum is σ = 20102130. Its totient is φ = 20102128.

The previous prime is 20102119. The next prime is 20102153. The reversal of 20102129 is 92120102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12390400 + 7711729 = 3520^2 + 2777^2 .

It is a cyclic number.

It is not a de Polignac number, because 20102129 - 2¹² = 20098033 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 (20102119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10051064 + 10051065.

It is an arithmetic number, because the mean of its divisors is an integer number (10051065).

Almost surely, 2^20102129 is an apocalyptic number.

It is an amenable number.

20102129 is a deficient number, since it is larger than the sum of its proper divisors (1).

20102129 is an equidigital number, since it uses as much as digits as its factorization.

20102129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 20102129 is about 4483.5397845899. The cubic root of 20102129 is about 271.9030120254.

The spelling of 20102129 in words is "twenty million, one hundred two thousand, one hundred twenty-nine".