21534065 has 8 divisors (see below), whose sum is σ = 29532480. Its totient is φ = 14766192.

The previous prime is 21534047. The next prime is 21534067. The reversal of 21534065 is 56043512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-21534065 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21534067) 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 7 ways as a sum of consecutive naturals, for example, 307595 + ... + 307664.

It is an arithmetic number, because the mean of its divisors is an integer number (3691560).

Almost surely, 2^21534065 is an apocalyptic number.

It is an amenable number.

21534065 is a deficient number, since it is larger than the sum of its proper divisors (7998415).

21534065 is an equidigital number, since it uses as much as digits as its factorization.

21534065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615271.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 21534065 is about 4640.4811172981. The cubic root of 21534065 is about 278.2116678940.

Adding to 21534065 its reverse (56043512), we get a palindrome (77577577).

The spelling of 21534065 in words is "twenty-one million, five hundred thirty-four thousand, sixty-five".