216381215 has 16 divisors (see below), whose sum is σ = 275425920. Its totient is φ = 162732960.

The previous prime is 216381211. The next prime is 216381229. The reversal of 216381215 is 512183612.

It is not a de Polignac number, because 216381215 - 2² = 216381211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216381211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3752 + ... + 21138.

It is an arithmetic number, because the mean of its divisors is an integer number (17214120).

Almost surely, 2^216381215 is an apocalyptic number.

216381215 is a deficient number, since it is larger than the sum of its proper divisors (59044705).

216381215 is a wasteful number, since it uses less digits than its factorization.

216381215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17542.

The product of its digits is 2880, while the sum is 29.

The square root of 216381215 is about 14709.9019371306. The cubic root of 216381215 is about 600.3527694008.

The spelling of 216381215 in words is "two hundred sixteen million, three hundred eighty-one thousand, two hundred fifteen".