21168086 has 16 divisors (see below), whose sum is σ = 33078240. Its totient is φ = 10147200.

The previous prime is 21168053. The next prime is 21168101. The reversal of 21168086 is 68086112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7550 + ... + 9966.

It is an arithmetic number, because the mean of its divisors is an integer number (2067390).

Almost surely, 2^21168086 is an apocalyptic number.

21168086 is a deficient number, since it is larger than the sum of its proper divisors (11910154).

21168086 is a wasteful number, since it uses less digits than its factorization.

21168086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2599.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 21168086 is about 4600.8788290934. The cubic root of 21168086 is about 276.6265521427.

The spelling of 21168086 in words is "twenty-one million, one hundred sixty-eight thousand, eighty-six".