20021220200129 has 2 divisors, whose sum is σ = 20021220200130. Its totient is φ = 20021220200128.

The previous prime is 20021220200123. The next prime is 20021220200207. The reversal of 20021220200129 is 92100202212002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14897878489729 + 5123341710400 = 3859777^2 + 2263480^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021220200129 - 2³² = 20016925232833 is a prime.

It is not a weakly prime, because it can be changed into another prime (20021220200123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010610100064 + 10010610100065.

It is an arithmetic number, because the mean of its divisors is an integer number (10010610100065).

Almost surely, 2^{20021220200129} is an apocalyptic number.

It is an amenable number.

20021220200129 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021220200129 is an equidigital number, since it uses as much as digits as its factorization.

20021220200129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

The spelling of 20021220200129 in words is "twenty trillion, twenty-one billion, two hundred twenty million, two hundred thousand, one hundred twenty-nine".