21035601 has 12 divisors (see below), whose sum is σ = 30443140. Its totient is φ = 13996800.

The previous prime is 21035561. The next prime is 21035611. The reversal of 21035601 is 10653012.

21035601 is a `hidden beast` number, since 2 + 103 + 560 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 16524225 + 4511376 = 4065^2 + 2124^2 .

It is not a de Polignac number, because 21035601 - 2⁶ = 21035537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21035611) 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 11 ways as a sum of consecutive naturals, for example, 3465 + ... + 7353.

Almost surely, 2^21035601 is an apocalyptic number.

It is an amenable number.

21035601 is a deficient number, since it is larger than the sum of its proper divisors (9407539).

21035601 is a wasteful number, since it uses less digits than its factorization.

21035601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4496 (or 4493 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 21035601 is about 4586.4584376183. The cubic root of 21035601 is about 276.0482351110.

Adding to 21035601 its reverse (10653012), we get a palindrome (31688613).

The spelling of 21035601 in words is "twenty-one million, thirty-five thousand, six hundred one".