121709827 has 4 divisors (see below), whose sum is σ = 121738536. Its totient is φ = 121681120.

The previous prime is 121709821. The next prime is 121709831. The reversal of 121709827 is 728907121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 728907121 = 409 ⋅1782169.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121709827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121709821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6598 + ... + 16939.

It is an arithmetic number, because the mean of its divisors is an integer number (30434634).

Almost surely, 2^121709827 is an apocalyptic number.

121709827 is a deficient number, since it is larger than the sum of its proper divisors (28709).

121709827 is an equidigital number, since it uses as much as digits as its factorization.

121709827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28708.

The product of its (nonzero) digits is 14112, while the sum is 37.

The square root of 121709827 is about 11032.2176827690. The cubic root of 121709827 is about 495.5740400241.

The spelling of 121709827 in words is "one hundred twenty-one million, seven hundred nine thousand, eight hundred twenty-seven".