121399127 has 6 divisors (see below), whose sum is σ = 121932672. Its totient is φ = 120867092.

The previous prime is 121399111. The next prime is 121399153. The reversal of 121399127 is 721993121.

It is not a de Polignac number, because 121399127 - 2⁴ = 121399111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121390127) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 215348 + ... + 215910.

It is an arithmetic number, because the mean of its divisors is an integer number (20322112).

Almost surely, 2^121399127 is an apocalyptic number.

121399127 is a deficient number, since it is larger than the sum of its proper divisors (533545).

121399127 is an frugal number, since it uses more digits than its factorization.

121399127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1509 (or 946 counting only the distinct ones).

The product of its digits is 6804, while the sum is 35.

The square root of 121399127 is about 11018.1272002097. The cubic root of 121399127 is about 495.1519813563.

The spelling of 121399127 in words is "one hundred twenty-one million, three hundred ninety-nine thousand, one hundred twenty-seven".