129212827 has 8 divisors (see below), whose sum is σ = 136223136. Its totient is φ = 122318592.

The previous prime is 129212819. The next prime is 129212857. The reversal of 129212827 is 728212921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129212827 - 2³ = 129212819 is a prime.

It is a super-2 number, since 2×129212827² = 33391909322663858, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129212792 and 129212801.

It is not an unprimeable number, because it can be changed into a prime (129212857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26728 + ... + 31189.

It is an arithmetic number, because the mean of its divisors is an integer number (17027892).

Almost surely, 2^129212827 is an apocalyptic number.

129212827 is a deficient number, since it is larger than the sum of its proper divisors (7010309).

129212827 is an equidigital number, since it uses as much as digits as its factorization.

129212827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58037.

The product of its digits is 8064, while the sum is 34.

The square root of 129212827 is about 11367.1820166653. The cubic root of 129212827 is about 505.5551546071. Note that the first 3 decimals are identical.

The spelling of 129212827 in words is "one hundred twenty-nine million, two hundred twelve thousand, eight hundred twenty-seven".