21120108 has 24 divisors (see below), whose sum is σ = 50330112. Its totient is φ = 6890064.

The previous prime is 21120089. The next prime is 21120109. The reversal of 21120108 is 80102112.

It is not an unprimeable number, because it can be changed into a prime (21120109) 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, 18160 + ... + 19287.

It is an arithmetic number, because the mean of its divisors is an integer number (2097088).

Almost surely, 2^21120108 is an apocalyptic number.

It is an amenable number.

21120108 is an abundant number, since it is smaller than the sum of its proper divisors (29210004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21120108 is a wasteful number, since it uses less digits than its factorization.

21120108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37501 (or 37499 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 21120108 is about 4595.6618674572. The cubic root of 21120108 is about 276.4174003649.

The spelling of 21120108 in words is "twenty-one million, one hundred twenty thousand, one hundred eight".