21140008 has 16 divisors (see below), whose sum is σ = 41724000. Its totient is φ = 10013616.

The previous prime is 21140003. The next prime is 21140011. The reversal of 21140008 is 80004112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21139973 and 21140000.

It is not an unprimeable number, because it can be changed into a prime (21140003) 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, 69388 + ... + 69691.

It is an arithmetic number, because the mean of its divisors is an integer number (2607750).

Almost surely, 2^21140008 is an apocalyptic number.

It is an amenable number.

21140008 is a deficient number, since it is larger than the sum of its proper divisors (20583992).

21140008 is a wasteful number, since it uses less digits than its factorization.

21140008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139104 (or 139100 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 21140008 is about 4597.8264430054. The cubic root of 21140008 is about 276.5041893707.

The spelling of 21140008 in words is "twenty-one million, one hundred forty thousand, eight".