215421065 has 8 divisors (see below), whose sum is σ = 258760320. Its totient is φ = 172166832.

The previous prime is 215421043. The next prime is 215421119. The reversal of 215421065 is 560124512.

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

It is a cyclic number.

It is not a de Polignac number, because 215421065 - 2¹⁰ = 215420041 is a prime.

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, 15539 + ... + 25928.

It is an arithmetic number, because the mean of its divisors is an integer number (32345040).

Almost surely, 2^215421065 is an apocalyptic number.

It is an amenable number.

215421065 is a deficient number, since it is larger than the sum of its proper divisors (43339255).

215421065 is a wasteful number, since it uses less digits than its factorization.

215421065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42511.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 215421065 is about 14677.2294728944. The cubic root of 215421065 is about 599.4634694420.

Adding to 215421065 its reverse (560124512), we get a palindrome (775545577).

The spelling of 215421065 in words is "two hundred fifteen million, four hundred twenty-one thousand, sixty-five".