21650241 has 8 divisors (see below), whose sum is σ = 28915264. Its totient is φ = 14409360.

The previous prime is 21650219. The next prime is 21650249. The reversal of 21650241 is 14205612.

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

It is not a de Polignac number, because 21650241 - 2²² = 17455937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21650249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3826 + ... + 7611.

It is an arithmetic number, because the mean of its divisors is an integer number (3614408).

Almost surely, 2^21650241 is an apocalyptic number.

It is an amenable number.

21650241 is a deficient number, since it is larger than the sum of its proper divisors (7265023).

21650241 is a wasteful number, since it uses less digits than its factorization.

21650241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12071.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 21650241 is about 4652.9819470959. The cubic root of 21650241 is about 278.7110869555.

Adding to 21650241 its reverse (14205612), we get a palindrome (35855853).

The spelling of 21650241 in words is "twenty-one million, six hundred fifty thousand, two hundred forty-one".