21730927 has 8 divisors (see below), whose sum is σ = 22962800. Its totient is φ = 20507904.

The previous prime is 21730903. The next prime is 21730957. The reversal of 21730927 is 72903712.

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

It is a cyclic number.

It is not a de Polignac number, because 21730927 - 2⁷ = 21730799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21730957) 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, 3199 + ... + 7327.

It is an arithmetic number, because the mean of its divisors is an integer number (2870350).

Almost surely, 2^21730927 is an apocalyptic number.

21730927 is a deficient number, since it is larger than the sum of its proper divisors (1231873).

21730927 is a wasteful number, since it uses less digits than its factorization.

21730927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4425.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 21730927 is about 4661.6442378200. The cubic root of 21730927 is about 279.0568907166.

The spelling of 21730927 in words is "twenty-one million, seven hundred thirty thousand, nine hundred twenty-seven".