21650529 has 8 divisors (see below), whose sum is σ = 28891840. Its totient is φ = 14421456.

The previous prime is 21650509. The next prime is 21650533. The reversal of 21650529 is 92505612.

It is a happy number.

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

It is not a de Polignac number, because 21650529 - 2⁹ = 21650017 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21650496 and 21650505.

It is not an unprimeable number, because it can be changed into a prime (21650509) 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, 2532 + ... + 7050.

It is an arithmetic number, because the mean of its divisors is an integer number (3611480).

Almost surely, 2^21650529 is an apocalyptic number.

It is an amenable number.

21650529 is a deficient number, since it is larger than the sum of its proper divisors (7241311).

21650529 is a wasteful number, since it uses less digits than its factorization.

21650529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6119.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 21650529 is about 4653.0128948886. The cubic root of 21650529 is about 278.7123227914.

The spelling of 21650529 in words is "twenty-one million, six hundred fifty thousand, five hundred twenty-nine".