129215811305 has 8 divisors (see below), whose sum is σ = 177210255552. Its totient is φ = 88605127728.

The previous prime is 129215811293. The next prime is 129215811313. The reversal of 129215811305 is 503118512921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129215811305 - 2²⁸ = 128947375849 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1845940127 + ... + 1845940196.

It is an arithmetic number, because the mean of its divisors is an integer number (22151281944).

Almost surely, 2^129215811305 is an apocalyptic number.

It is an amenable number.

129215811305 is a deficient number, since it is larger than the sum of its proper divisors (47994444247).

129215811305 is an equidigital number, since it uses as much as digits as its factorization.

129215811305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3691880335.

The product of its (nonzero) digits is 21600, while the sum is 38.

The spelling of 129215811305 in words is "one hundred twenty-nine billion, two hundred fifteen million, eight hundred eleven thousand, three hundred five".