118421 has 4 divisors (see below), whose sum is σ = 120000. Its totient is φ = 116844.

The previous prime is 118411. The next prime is 118423. The reversal of 118421 is 124811.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 124811 = 19 ⋅6569.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-118421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 118421.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 118421.

It is not an unprimeable number, because it can be changed into a prime (118423) 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, 671 + ... + 828.

It is an arithmetic number, because the mean of its divisors is an integer number (30000).

2¹¹⁸⁴²¹ is an apocalyptic number.

It is an amenable number.

118421 is a deficient number, since it is larger than the sum of its proper divisors (1579).

118421 is an equidigital number, since it uses as much as digits as its factorization.

118421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1578.

The product of its digits is 64, while the sum is 17.

The square root of 118421 is about 344.1235243339. The cubic root of 118421 is about 49.1069439866.

The spelling of 118421 in words is "one hundred eighteen thousand, four hundred twenty-one".