21350065 has 8 divisors (see below), whose sum is σ = 27949248. Its totient is φ = 15527280.

The previous prime is 21350039. The next prime is 21350071. The reversal of 21350065 is 56005312.

It is a happy number.

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

It is not a de Polignac number, because 21350065 - 2¹¹ = 21348017 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194037 + ... + 194146.

It is an arithmetic number, because the mean of its divisors is an integer number (3493656).

Almost surely, 2^21350065 is an apocalyptic number.

It is an amenable number.

21350065 is a deficient number, since it is larger than the sum of its proper divisors (6599183).

21350065 is a wasteful number, since it uses less digits than its factorization.

21350065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388199.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 21350065 is about 4620.6130545632. The cubic root of 21350065 is about 277.4169976036.

Adding to 21350065 its reverse (56005312), we get a palindrome (77355377).

The spelling of 21350065 in words is "twenty-one million, three hundred fifty thousand, sixty-five".