118281621 has 4 divisors (see below), whose sum is σ = 157708832. Its totient is φ = 78854412.

The previous prime is 118281601. The next prime is 118281629. The reversal of 118281621 is 126182811.

It is a happy number.

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.

It is not a de Polignac number, because 118281621 - 2¹¹ = 118279573 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 (118281629) 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, 19713601 + ... + 19713606.

It is an arithmetic number, because the mean of its divisors is an integer number (39427208).

Almost surely, 2^118281621 is an apocalyptic number.

It is an amenable number.

118281621 is a deficient number, since it is larger than the sum of its proper divisors (39427211).

118281621 is an equidigital number, since it uses as much as digits as its factorization.

118281621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39427210.

The product of its digits is 1536, while the sum is 30.

The square root of 118281621 is about 10875.7354234093. The cubic root of 118281621 is about 490.8767048001.

The spelling of 118281621 in words is "one hundred eighteen million, two hundred eighty-one thousand, six hundred twenty-one".