118897221 has 4 divisors (see below), whose sum is σ = 158529632. Its totient is φ = 79264812.

The previous prime is 118897211. The next prime is 118897237. The reversal of 118897221 is 122798811.

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: 122798811 = 3 ⋅40932937.

It is not a de Polignac number, because 118897221 - 2⁶ = 118897157 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 118897221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118897211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19816201 + ... + 19816206.

It is an arithmetic number, because the mean of its divisors is an integer number (39632408).

Almost surely, 2^118897221 is an apocalyptic number.

It is an amenable number.

118897221 is a deficient number, since it is larger than the sum of its proper divisors (39632411).

118897221 is an equidigital number, since it uses as much as digits as its factorization.

118897221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39632410.

The product of its digits is 16128, while the sum is 39.

The square root of 118897221 is about 10904.0002292737. Note that the first 3 decimals coincide. The cubic root of 118897221 is about 491.7268255157.

It can be divided in two parts, 11889 and 7221, that added together give a triangular number (19110 = T₁₉₅).

The spelling of 118897221 in words is "one hundred eighteen million, eight hundred ninety-seven thousand, two hundred twenty-one".