2129039929129 has 3 divisors (see below), whose sum is σ = 2129041388253. Its totient is φ = 2129038470006.

The previous prime is 2129039929111. The next prime is 2129039929151. The reversal of 2129039929129 is 9219299309212.

The square root of 2129039929129 is 1459123.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 2129039929129 - 2¹⁷ = 2129039798057 is a prime.

It is a super-2 number, since 2×2129039929129² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2129039929729) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 729562 + ... + 2188684.

It is an arithmetic number, because the mean of its divisors is an integer number (709680462751).

Almost surely, 2^{2129039929129} is an apocalyptic number.

2129039929129 is the 1459123-rd square number.

2129039929129 is the 729562-nd centered octagonal number.

It is an amenable number.

2129039929129 is a deficient number, since it is larger than the sum of its proper divisors (1459124).

2129039929129 is an frugal number, since it uses more digits than its factorization.

2129039929129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2918246 (or 1459123 counting only the distinct ones).

The product of its (nonzero) digits is 2834352, while the sum is 58.

The spelling of 2129039929129 in words is "two trillion, one hundred twenty-nine billion, thirty-nine million, nine hundred twenty-nine thousand, one hundred twenty-nine".