20021302129 has 2 divisors, whose sum is σ = 20021302130. Its totient is φ = 20021302128.

The previous prime is 20021302123. The next prime is 20021302153. The reversal of 20021302129 is 92120312002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19819008400 + 202293729 = 140780^2 + 14223^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021302129 - 2¹³ = 20021293937 is a prime.

It is not a weakly prime, because it can be changed into another prime (20021302123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010651064 + 10010651065.

It is an arithmetic number, because the mean of its divisors is an integer number (10010651065).

Almost surely, 2^20021302129 is an apocalyptic number.

It is an amenable number.

20021302129 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021302129 is an equidigital number, since it uses as much as digits as its factorization.

20021302129 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 22.

The spelling of 20021302129 in words is "twenty billion, twenty-one million, three hundred two thousand, one hundred twenty-nine".