129127216 has 10 divisors (see below), whose sum is σ = 250184012. Its totient is φ = 64563600.

The previous prime is 129127181. The next prime is 129127217. The reversal of 129127216 is 612721921.

It is not an unprimeable number, because it can be changed into a prime (129127217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4035210 + ... + 4035241.

Almost surely, 2^129127216 is an apocalyptic number.

129127216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

129127216 is a deficient number, since it is larger than the sum of its proper divisors (121056796).

129127216 is an equidigital number, since it uses as much as digits as its factorization.

129127216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8070459 (or 8070453 counting only the distinct ones).

The product of its digits is 3024, while the sum is 31.

The square root of 129127216 is about 11363.4156836754. The cubic root of 129127216 is about 505.4434767249.

The spelling of 129127216 in words is "one hundred twenty-nine million, one hundred twenty-seven thousand, two hundred sixteen".