129218988019 has 4 divisors (see below), whose sum is σ = 140966168760. Its totient is φ = 117471807280.

The previous prime is 129218987999. The next prime is 129218988061. The reversal of 129218988019 is 910889812921.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 129218988019 - 2²³ = 129210599411 is a prime.

It is a super-2 number, since 2×129218988019² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129218988419) 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, 5873590354 + ... + 5873590375.

It is an arithmetic number, because the mean of its divisors is an integer number (35241542190).

Almost surely, 2^129218988019 is an apocalyptic number.

129218988019 is a deficient number, since it is larger than the sum of its proper divisors (11747180741).

129218988019 is a wasteful number, since it uses less digits than its factorization.

129218988019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11747180740.

The product of its (nonzero) digits is 1492992, while the sum is 58.

The spelling of 129218988019 in words is "one hundred twenty-nine billion, two hundred eighteen million, nine hundred eighty-eight thousand, nineteen".