21693683 has 8 divisors (see below), whose sum is σ = 25058160. Its totient is φ = 18561280.

The previous prime is 21693673. The next prime is 21693697. The reversal of 21693683 is 38639612.

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

It is not a de Polignac number, because 21693683 - 2⁴ = 21693667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21693673) 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, 57818 + ... + 58191.

It is an arithmetic number, because the mean of its divisors is an integer number (3132270).

Almost surely, 2^21693683 is an apocalyptic number.

21693683 is a deficient number, since it is larger than the sum of its proper divisors (3364477).

21693683 is a wasteful number, since it uses less digits than its factorization.

21693683 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116037.

The product of its digits is 46656, while the sum is 38.

The square root of 21693683 is about 4657.6477969035. The cubic root of 21693683 is about 278.8973770731.

The spelling of 21693683 in words is "twenty-one million, six hundred ninety-three thousand, six hundred eighty-three".