21335461 has 12 divisors (see below), whose sum is σ = 25737312. Its totient is φ = 17322984.

The previous prime is 21335453. The next prime is 21335477. The reversal of 21335461 is 16453312.

It is not a de Polignac number, because 21335461 - 2³ = 21335453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21335411) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1695 + ... + 6748.

It is an arithmetic number, because the mean of its divisors is an integer number (2144776).

Almost surely, 2^21335461 is an apocalyptic number.

It is an amenable number.

21335461 is a deficient number, since it is larger than the sum of its proper divisors (4401851).

21335461 is an equidigital number, since it uses as much as digits as its factorization.

21335461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8488 (or 8469 counting only the distinct ones).

The product of its digits is 2160, while the sum is 25.

The square root of 21335461 is about 4619.0324744474. The cubic root of 21335461 is about 277.3537296942.

Adding to 21335461 its reverse (16453312), we get a palindrome (37788773).

The spelling of 21335461 in words is "twenty-one million, three hundred thirty-five thousand, four hundred sixty-one".