21120118 has 16 divisors (see below), whose sum is σ = 33953760. Its totient is φ = 9827136.

The previous prime is 21120109. The next prime is 21120119. The reversal of 21120118 is 81102112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4503 + ... + 7906.

It is an arithmetic number, because the mean of its divisors is an integer number (2122110).

Almost surely, 2^21120118 is an apocalyptic number.

21120118 is a deficient number, since it is larger than the sum of its proper divisors (12833642).

21120118 is a wasteful number, since it uses less digits than its factorization.

21120118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12471.

The product of its (nonzero) digits is 32, while the sum is 16.

The square root of 21120118 is about 4595.6629554396. The cubic root of 21120118 is about 276.4174439911.

The spelling of 21120118 in words is "twenty-one million, one hundred twenty thousand, one hundred eighteen".