21435461 has 4 divisors (see below), whose sum is σ = 21786924. Its totient is φ = 21084000.

The previous prime is 21435451. The next prime is 21435473. The reversal of 21435461 is 16453412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1943236 + 19492225 = 1394^2 + 4415^2 .

It is a cyclic number.

It is not a de Polignac number, because 21435461 - 2¹⁰ = 21434437 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21435461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21435451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175640 + ... + 175761.

It is an arithmetic number, because the mean of its divisors is an integer number (5446731).

Almost surely, 2^21435461 is an apocalyptic number.

It is an amenable number.

21435461 is a deficient number, since it is larger than the sum of its proper divisors (351463).

21435461 is an equidigital number, since it uses as much as digits as its factorization.

21435461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351462.

The product of its digits is 2880, while the sum is 26.

The square root of 21435461 is about 4629.8445978240. The cubic root of 21435461 is about 277.7863764390.

Adding to 21435461 its reverse (16453412), we get a palindrome (37888873).

The spelling of 21435461 in words is "twenty-one million, four hundred thirty-five thousand, four hundred sixty-one".