21650535 has 12 divisors (see below), whose sum is σ = 37527672. Its totient is φ = 11546928.

The previous prime is 21650533. The next prime is 21650539. The reversal of 21650535 is 53505612.

21650535 is a `hidden beast` number, since 2 + 1 + 650 + 5 + 3 + 5 = 666.

It is not a de Polignac number, because 21650535 - 2¹ = 21650533 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21650499 and 21650508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21650533) 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 11 ways as a sum of consecutive naturals, for example, 240517 + ... + 240606.

It is an arithmetic number, because the mean of its divisors is an integer number (3127306).

Almost surely, 2^21650535 is an apocalyptic number.

21650535 is a deficient number, since it is larger than the sum of its proper divisors (15877137).

21650535 is a wasteful number, since it uses less digits than its factorization.

21650535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481134 (or 481131 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The square root of 21650535 is about 4653.0135396321. The cubic root of 21650535 is about 278.7123485379.

The spelling of 21650535 in words is "twenty-one million, six hundred fifty thousand, five hundred thirty-five".