21086158 has 8 divisors (see below), whose sum is σ = 31649040. Its totient is φ = 10536480.

The previous prime is 21086141. The next prime is 21086179. The reversal of 21086158 is 85168012.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3478 + ... + 7366.

It is an arithmetic number, because the mean of its divisors is an integer number (3956130).

Almost surely, 2^21086158 is an apocalyptic number.

21086158 is a deficient number, since it is larger than the sum of its proper divisors (10562882).

21086158 is a wasteful number, since it uses less digits than its factorization.

21086158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6602.

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 21086158 is about 4591.9666810638. The cubic root of 21086158 is about 276.2692097778.

It can be divided in two parts, 210 and 86158, that added together give a palindrome (86368).

The spelling of 21086158 in words is "twenty-one million, eighty-six thousand, one hundred fifty-eight".