118999921 has 4 divisors (see below), whose sum is σ = 119023344. Its totient is φ = 118976500.

The previous prime is 118999919. The next prime is 118999927. The reversal of 118999921 is 129999811.

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 a cyclic number.

It is not a de Polignac number, because 118999921 - 2¹ = 118999919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (118999927) 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, 535 + ... + 15436.

It is an arithmetic number, because the mean of its divisors is an integer number (29755836).

Almost surely, 2^118999921 is an apocalyptic number.

It is an amenable number.

118999921 is a deficient number, since it is larger than the sum of its proper divisors (23423).

118999921 is an equidigital number, since it uses as much as digits as its factorization.

118999921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23422.

The product of its digits is 104976, while the sum is 49.

The square root of 118999921 is about 10908.7084936761. The cubic root of 118999921 is about 491.8683646010.

The spelling of 118999921 in words is "one hundred eighteen million, nine hundred ninety-nine thousand, nine hundred twenty-one".