129321557006 has 4 divisors (see below), whose sum is σ = 193982335512. Its totient is φ = 64660778502.

The previous prime is 129321556979. The next prime is 129321557017. The reversal of 129321557006 is 600755123921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 600755123921 = 97 ⋅6193351793.

It is a super-2 number, since 2×129321557006² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 32330389250 + ... + 32330389253.

It is an arithmetic number, because the mean of its divisors is an integer number (48495583878).

Almost surely, 2^129321557006 is an apocalyptic number.

129321557006 is a deficient number, since it is larger than the sum of its proper divisors (64660778506).

129321557006 is an equidigital number, since it uses as much as digits as its factorization.

129321557006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64660778505.

The product of its (nonzero) digits is 113400, while the sum is 41.

The spelling of 129321557006 in words is "one hundred twenty-nine billion, three hundred twenty-one million, five hundred fifty-seven thousand, six".