121105129 has 4 divisors (see below), whose sum is σ = 121205376. Its totient is φ = 121004884.

The previous prime is 121105121. The next prime is 121105141. The reversal of 121105129 is 921501121.

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, and also an emirpimes, since its reverse is a distinct semiprime: 921501121 = 19 ⋅48500059.

It is a cyclic number.

It is not a de Polignac number, because 121105129 - 2³ = 121105121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121105121) 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, 48289 + ... + 50734.

It is an arithmetic number, because the mean of its divisors is an integer number (30301344).

Almost surely, 2^121105129 is an apocalyptic number.

It is an amenable number.

121105129 is a deficient number, since it is larger than the sum of its proper divisors (100247).

121105129 is an equidigital number, since it uses as much as digits as its factorization.

121105129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100246.

The product of its (nonzero) digits is 180, while the sum is 22.

The square root of 121105129 is about 11004.7775534083. Note that the first 3 decimals coincide. The cubic root of 121105129 is about 494.7519472747.

The spelling of 121105129 in words is "one hundred twenty-one million, one hundred five thousand, one hundred twenty-nine".