121387 has 4 divisors (see below), whose sum is σ = 138736. Its totient is φ = 104040.

The previous prime is 121379. The next prime is 121403. The reversal of 121387 is 783121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121387 - 2³ = 121379 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (121327) 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, 8664 + ... + 8677.

It is an arithmetic number, because the mean of its divisors is an integer number (34684).

2¹²¹³⁸⁷ is an apocalyptic number.

121387 is a deficient number, since it is larger than the sum of its proper divisors (17349).

121387 is an equidigital number, since it uses as much as digits as its factorization.

121387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17348.

The product of its digits is 336, while the sum is 22.

The square root of 121387 is about 348.4063719280. The cubic root of 121387 is about 49.5135493297.

The spelling of 121387 in words is "one hundred twenty-one thousand, three hundred eighty-seven".