118357221 has 4 divisors (see below), whose sum is σ = 157809632. Its totient is φ = 78904812.

The previous prime is 118357219. The next prime is 118357223. The reversal of 118357221 is 122753811.

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: 122753811 = 3 ⋅40917937.

It is an interprime number because it is at equal distance from previous prime (118357219) and next prime (118357223).

It is not a de Polignac number, because 118357221 - 2¹ = 118357219 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 (118357223) 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 3 ways as a sum of consecutive naturals, for example, 19726201 + ... + 19726206.

It is an arithmetic number, because the mean of its divisors is an integer number (39452408).

Almost surely, 2^118357221 is an apocalyptic number.

It is an amenable number.

118357221 is a deficient number, since it is larger than the sum of its proper divisors (39452411).

118357221 is an equidigital number, since it uses as much as digits as its factorization.

118357221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39452410.

The product of its digits is 3360, while the sum is 30.

The square root of 118357221 is about 10879.2104952519. The cubic root of 118357221 is about 490.9812642265.

The spelling of 118357221 in words is "one hundred eighteen million, three hundred fifty-seven thousand, two hundred twenty-one".