129447215426 has 16 divisors (see below), whose sum is σ = 194408308248. Its totient is φ = 64644480000.

The previous prime is 129447215371. The next prime is 129447215461. The reversal of 129447215426 is 624512744921.

It can be written as a sum of positive squares in 4 ways, for example, as 127662575401 + 1784640025 = 357299^2 + 42245^2 .

It is a super-2 number, since 2×129447215426² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14376926 + ... + 14385926.

Almost surely, 2^129447215426 is an apocalyptic number.

129447215426 is a deficient number, since it is larger than the sum of its proper divisors (64961092822).

129447215426 is a wasteful number, since it uses less digits than its factorization.

129447215426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16997.

The product of its digits is 967680, while the sum is 47.

The spelling of 129447215426 in words is "one hundred twenty-nine billion, four hundred forty-seven million, two hundred fifteen thousand, four hundred twenty-six".