129983605921 has 16 divisors (see below), whose sum is σ = 146082625920. Its totient is φ = 114757061760.

The previous prime is 129983605919. The next prime is 129983605937. The reversal of 129983605921 is 129506389921.

It is a cyclic number.

It is not a de Polignac number, because 129983605921 - 2¹ = 129983605919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129983605901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5588965 + ... + 5612173.

It is an arithmetic number, because the mean of its divisors is an integer number (9130164120).

Almost surely, 2^129983605921 is an apocalyptic number.

It is an amenable number.

129983605921 is a deficient number, since it is larger than the sum of its proper divisors (16099019999).

129983605921 is a wasteful number, since it uses less digits than its factorization.

129983605921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41976.

The product of its (nonzero) digits is 2099520, while the sum is 55.

The spelling of 129983605921 in words is "one hundred twenty-nine billion, nine hundred eighty-three million, six hundred five thousand, nine hundred twenty-one".