129363921 has 6 divisors (see below), whose sum is σ = 186859010. Its totient is φ = 86242608.

The previous prime is 129363919. The next prime is 129363929.

It is a happy number.

129363921 is a `hidden beast` number, since 12 + 9 + 3 + 639 + 2 + 1 = 666.

129363921 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 129072321 + 291600 = 11361^2 + 540^2 .

It is not a de Polignac number, because 129363921 - 2¹ = 129363919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129363929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7186876 + ... + 7186893.

Almost surely, 2^129363921 is an apocalyptic number.

It is an amenable number.

129363921 is a deficient number, since it is larger than the sum of its proper divisors (57495089).

129363921 is a wasteful number, since it uses less digits than its factorization.

129363921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14373775 (or 14373772 counting only the distinct ones).

The product of its digits is 17496, while the sum is 36.

The square root of 129363921 is about 11373.8261372328. The cubic root of 129363921 is about 505.7521334925.

The spelling of 129363921 in words is "one hundred twenty-nine million, three hundred sixty-three thousand, nine hundred twenty-one".