21086363 has 4 divisors (see below), whose sum is σ = 21098688. Its totient is φ = 21074040.

The previous prime is 21086347. The next prime is 21086381. The reversal of 21086363 is 36368012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21086363 - 2⁴ = 21086347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21086563) 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, 3083 + ... + 7188.

It is an arithmetic number, because the mean of its divisors is an integer number (5274672).

Almost surely, 2^21086363 is an apocalyptic number.

21086363 is a deficient number, since it is larger than the sum of its proper divisors (12325).

21086363 is a wasteful number, since it uses less digits than its factorization.

21086363 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12324.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 21086363 is about 4591.9890026001. The cubic root of 21086363 is about 276.2701050729.

The spelling of 21086363 in words is "twenty-one million, eighty-six thousand, three hundred sixty-three".