21086343 has 12 divisors (see below), whose sum is σ = 30524520. Its totient is φ = 14026896.

The previous prime is 21086327. The next prime is 21086347. The reversal of 21086343 is 34368012.

It is a happy number.

21086343 is a `hidden beast` number, since 21 + 0 + 8 + 634 + 3 = 666.

It is not a de Polignac number, because 21086343 - 2⁴ = 21086327 is a prime.

It is a super-2 number, since 2×21086343² = 889267722227298, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21086347) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2280 + ... + 6882.

It is an arithmetic number, because the mean of its divisors is an integer number (2543710).

Almost surely, 2^21086343 is an apocalyptic number.

21086343 is a deficient number, since it is larger than the sum of its proper divisors (9438177).

21086343 is a wasteful number, since it uses less digits than its factorization.

21086343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5118 (or 5115 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 21086343 is about 4591.9868248940. The cubic root of 21086343 is about 276.2700177273.

The spelling of 21086343 in words is "twenty-one million, eighty-six thousand, three hundred forty-three".