21650445 has 24 divisors (see below), whose sum is σ = 37791000. Its totient is φ = 11465856.

The previous prime is 21650437. The next prime is 21650449. The reversal of 21650445 is 54405612.

21650445 is a `hidden beast` number, since 2 + 1 + 650 + 4 + 4 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 36 + 21650409 = 6^2 + 4653^2 .

It is not a de Polignac number, because 21650445 - 2³ = 21650437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21650449) 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 23 ways as a sum of consecutive naturals, for example, 5091 + ... + 8319.

It is an arithmetic number, because the mean of its divisors is an integer number (1574625).

Almost surely, 2^21650445 is an apocalyptic number.

It is an amenable number.

21650445 is a deficient number, since it is larger than the sum of its proper divisors (16140555).

21650445 is a wasteful number, since it uses less digits than its factorization.

21650445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3389 (or 3386 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 21650445 is about 4653.0038684703. The cubic root of 21650445 is about 278.7119623404.

The spelling of 21650445 in words is "twenty-one million, six hundred fifty thousand, four hundred forty-five".