129130121 has 4 divisors (see below), whose sum is σ = 129153552. Its totient is φ = 129106692.

The previous prime is 129130117. The next prime is 129130129. The reversal of 129130121 is 121031921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 129130121 - 2² = 129130117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129130093 and 129130102.

It is not an unprimeable number, because it can be changed into a prime (129130129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1586 + ... + 16148.

It is an arithmetic number, because the mean of its divisors is an integer number (32288388).

Almost surely, 2^129130121 is an apocalyptic number.

It is an amenable number.

129130121 is a deficient number, since it is larger than the sum of its proper divisors (23431).

129130121 is an equidigital number, since it uses as much as digits as its factorization.

129130121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23430.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 129130121 is about 11363.5435054388. The cubic root of 129130121 is about 505.4472670497.

The spelling of 129130121 in words is "one hundred twenty-nine million, one hundred thirty thousand, one hundred twenty-one".