216126215 has 4 divisors (see below), whose sum is σ = 259351464. Its totient is φ = 172900968.

The previous prime is 216126191. The next prime is 216126221. The reversal of 216126215 is 512621612.

216126215 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 216126215 - 2²⁴ = 199348999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21612617 + ... + 21612626.

It is an arithmetic number, because the mean of its divisors is an integer number (64837866).

Almost surely, 2^216126215 is an apocalyptic number.

216126215 is a deficient number, since it is larger than the sum of its proper divisors (43225249).

216126215 is an equidigital number, since it uses as much as digits as its factorization.

216126215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43225248.

The product of its digits is 1440, while the sum is 26.

The square root of 216126215 is about 14701.2317511153. The cubic root of 216126215 is about 600.1168429855.

Adding to 216126215 its reverse (512621612), we get a palindrome (728747827).

The spelling of 216126215 in words is "two hundred sixteen million, one hundred twenty-six thousand, two hundred fifteen".