1000121210129 has 2 divisors, whose sum is σ = 1000121210130. Its totient is φ = 1000121210128.

The previous prime is 1000121210119. The next prime is 1000121210177. The reversal of 1000121210129 is 9210121210001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 990900793600 + 9220416529 = 995440^2 + 96023^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000121210129 - 2²⁰ = 1000120161553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1000121210129.

It is not a weakly prime, because it can be changed into another prime (1000121210119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500060605064 + 500060605065.

It is an arithmetic number, because the mean of its divisors is an integer number (500060605065).

Almost surely, 2^{1000121210129} is an apocalyptic number.

It is an amenable number.

1000121210129 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000121210129 is an equidigital number, since it uses as much as digits as its factorization.

1000121210129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 1000121210129 in words is "one trillion, one hundred twenty-one million, two hundred ten thousand, one hundred twenty-nine".