129464929464921 has 6 divisors (see below), whose sum is σ = 187004898116010. Its totient is φ = 86309952976608.

The previous prime is 129464929464919. The next prime is 129464929464929.

129464929464921 is a `hidden beast` number, since 1 + 2 + 9 + 4 + 6 + 4 + 92 + 9 + 46 + 492 + 1 = 666.

129464929464921 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 104959102952025 + 24505826512896 = 10244955^2 + 4950336^2 .

It is not a de Polignac number, because 129464929464921 - 2¹ = 129464929464919 is a prime.

It is a super-2 number, since 2×129464929464921² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 129464929464921.

It is not an unprimeable number, because it can be changed into a prime (129464929464929) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7192496081376 + ... + 7192496081393.

It is an arithmetic number, because the mean of its divisors is an integer number (31167483019335).

Almost surely, 2^{129464929464921} is an apocalyptic number.

It is an amenable number.

129464929464921 is a deficient number, since it is larger than the sum of its proper divisors (57539968651089).

129464929464921 is a wasteful number, since it uses less digits than its factorization.

129464929464921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14384992162775 (or 14384992162772 counting only the distinct ones).

The product of its digits is 483729408, while the sum is 72.

The spelling of 129464929464921 in words is "one hundred twenty-nine trillion, four hundred sixty-four billion, nine hundred twenty-nine million, four hundred sixty-four thousand, nine hundred twenty-one".