21936229 has 8 divisors (see below), whose sum is σ = 25113600. Its totient is φ = 18769776.

The previous prime is 21936217. The next prime is 21936247. The reversal of 21936229 is 92263912.

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 21936229 - 2⁹ = 21935717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21936194 and 21936203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21936529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2172 + ... + 6970.

It is an arithmetic number, because the mean of its divisors is an integer number (3139200).

Almost surely, 2^21936229 is an apocalyptic number.

It is an amenable number.

21936229 is a deficient number, since it is larger than the sum of its proper divisors (3177371).

21936229 is an equidigital number, since it uses as much as digits as its factorization.

21936229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5459.

The product of its digits is 11664, while the sum is 34.

The square root of 21936229 is about 4683.6128149112. The cubic root of 21936229 is about 279.9329303644.

The spelling of 21936229 in words is "twenty-one million, nine hundred thirty-six thousand, two hundred twenty-nine".