118997221 has 4 divisors (see below), whose sum is σ = 135996832. Its totient is φ = 101997612.

The previous prime is 118997213. The next prime is 118997267. The reversal of 118997221 is 122799811.

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: 122799811 = 67 ⋅1832833.

It is a cyclic number.

It is not a de Polignac number, because 118997221 - 2³ = 118997213 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 (118997201) 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, 8499795 + ... + 8499808.

It is an arithmetic number, because the mean of its divisors is an integer number (33999208).

Almost surely, 2^118997221 is an apocalyptic number.

It is an amenable number.

118997221 is a deficient number, since it is larger than the sum of its proper divisors (16999611).

118997221 is an equidigital number, since it uses as much as digits as its factorization.

118997221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16999610.

The product of its digits is 18144, while the sum is 40.

The square root of 118997221 is about 10908.5847386359. The cubic root of 118997221 is about 491.8646445576.

The spelling of 118997221 in words is "one hundred eighteen million, nine hundred ninety-seven thousand, two hundred twenty-one".