21103008 has 24 divisors (see below), whose sum is σ = 55395648.
Its totient is φ = 7034304.
The previous prime is 21103003. The next prime is 21103021. The reversal of 21103008 is 80030112.
It is a happy number.
It is a tau number, because it is divible by the number of its divisors (24).
It is not an unprimeable number, because it can be changed into a prime (21103003) 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, 109816 + ... + 110007.
It is an arithmetic number, because the mean of its divisors is an integer number (2308152).
Almost surely, 221103008 is an apocalyptic number.
It is an amenable number.
21103008 is an abundant number, since it is smaller than the sum of its proper divisors (34292640).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21103008 is a wasteful number, since it uses less digits than its factorization.
21103008 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 219836 (or 219828 counting only the distinct ones).
The product of its (nonzero) digits is 48, while the sum is 15.
The square root of 21103008 is about 4593.8010405328.
The cubic root of 21103008 is about 276.3427793166.
The spelling of 21103008 in words is "twenty-one million, one hundred three thousand, eight".