215420215 has 4 divisors (see below), whose sum is σ = 258504264. Its totient is φ = 172336168.

The previous prime is 215420213. The next prime is 215420237. The reversal of 215420215 is 512024512.

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

It is a cyclic number.

It is not a de Polignac number, because 215420215 - 2¹ = 215420213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215420213) 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, 21542017 + ... + 21542026.

It is an arithmetic number, because the mean of its divisors is an integer number (64626066).

Almost surely, 2^215420215 is an apocalyptic number.

215420215 is a deficient number, since it is larger than the sum of its proper divisors (43084049).

215420215 is an equidigital number, since it uses as much as digits as its factorization.

215420215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43084048.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 215420215 is about 14677.2005164473. The cubic root of 215420215 is about 599.4626809945.

Adding to 215420215 its reverse (512024512), we get a palindrome (727444727).

The spelling of 215420215 in words is "two hundred fifteen million, four hundred twenty thousand, two hundred fifteen".