21344535 has 24 divisors (see below), whose sum is σ = 37134864. Its totient is φ = 11341440.

The previous prime is 21344513. The next prime is 21344593. The reversal of 21344535 is 53544312.

21344535 is a `hidden beast` number, since 213 + 445 + 3 + 5 = 666.

It is not a de Polignac number, because 21344535 - 2⁶ = 21344471 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21344499 and 21344508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14179 + ... + 15611.

It is an arithmetic number, because the mean of its divisors is an integer number (1547286).

Almost surely, 2^21344535 is an apocalyptic number.

21344535 is a deficient number, since it is larger than the sum of its proper divisors (15790329).

21344535 is a wasteful number, since it uses less digits than its factorization.

21344535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1775 (or 1772 counting only the distinct ones).

The product of its digits is 7200, while the sum is 27.

The square root of 21344535 is about 4620.0146103665. The cubic root of 21344535 is about 277.3930437582.

Adding to 21344535 its reverse (53544312), we get a palindrome (74888847).

The spelling of 21344535 in words is "twenty-one million, three hundred forty-four thousand, five hundred thirty-five".