200121002129 has 2 divisors, whose sum is σ = 200121002130. Its totient is φ = 200121002128.

The previous prime is 200121002087. The next prime is 200121002149. The reversal of 200121002129 is 921200121002.

It is a happy number.

It is an a-pointer prime, because the next prime (200121002149) can be obtained adding 200121002129 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 185726521600 + 14394480529 = 430960^2 + 119977^2 .

It is a cyclic number.

It is not a de Polignac number, because 200121002129 - 2¹⁶ = 200120936593 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 200121002129.

It is not a weakly prime, because it can be changed into another prime (200121002149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100060501064 + 100060501065.

It is an arithmetic number, because the mean of its divisors is an integer number (100060501065).

Almost surely, 2^200121002129 is an apocalyptic number.

It is an amenable number.

200121002129 is a deficient number, since it is larger than the sum of its proper divisors (1).

200121002129 is an equidigital number, since it uses as much as digits as its factorization.

200121002129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 200121002129 in words is "two hundred billion, one hundred twenty-one million, two thousand, one hundred twenty-nine".