21933427 has 8 divisors (see below), whose sum is σ = 22561200. Its totient is φ = 21314304.

The previous prime is 21933419. The next prime is 21933449. The reversal of 21933427 is 72433912.

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 21933427 - 2³ = 21933419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21933487) 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, 3163 + ... + 7339.

It is an arithmetic number, because the mean of its divisors is an integer number (2820150).

Almost surely, 2^21933427 is an apocalyptic number.

21933427 is a deficient number, since it is larger than the sum of its proper divisors (627773).

21933427 is an equidigital number, since it uses as much as digits as its factorization.

21933427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4325.

The product of its digits is 9072, while the sum is 31.

The square root of 21933427 is about 4683.3136773016. The cubic root of 21933427 is about 279.9210108822.

The spelling of 21933427 in words is "twenty-one million, nine hundred thirty-three thousand, four hundred twenty-seven".