21008107 has 8 divisors (see below), whose sum is σ = 22718016. Its totient is φ = 19350912.

The previous prime is 21008083. The next prime is 21008149. The reversal of 21008107 is 70180012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21008107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21003107) 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, 12348 + ... + 13945.

It is an arithmetic number, because the mean of its divisors is an integer number (2839752).

Almost surely, 2^21008107 is an apocalyptic number.

21008107 is a deficient number, since it is larger than the sum of its proper divisors (1709909).

21008107 is a wasteful number, since it uses less digits than its factorization.

21008107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26357.

The product of its (nonzero) digits is 112, while the sum is 19.

The square root of 21008107 is about 4583.4601558211. The cubic root of 21008107 is about 275.9279156075.

Adding to 21008107 its reverse (70180012), we get a palindrome (91188119).

It can be divided in two parts, 21008 and 107, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 21008107 in words is "twenty-one million, eight thousand, one hundred seven".