129121248816 has 60 divisors (see below), whose sum is σ = 412983045072. Its totient is φ = 36891785088.

The previous prime is 129121248803. The next prime is 129121248829. The reversal of 129121248816 is 618842121921.

It is an interprime number because it is at equal distance from previous prime (129121248803) and next prime (129121248829).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64047231 + ... + 64049246.

Almost surely, 2^129121248816 is an apocalyptic number.

129121248816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

129121248816 is an abundant number, since it is smaller than the sum of its proper divisors (283861796256).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129121248816 is a wasteful number, since it uses less digits than its factorization.

129121248816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128096498 (or 128096489 counting only the distinct ones).

The product of its digits is 110592, while the sum is 45.

The spelling of 129121248816 in words is "one hundred twenty-nine billion, one hundred twenty-one million, two hundred forty-eight thousand, eight hundred sixteen".