216381214 has 16 divisors (see below), whose sum is σ = 374224608. Its totient is φ = 91913472.

The previous prime is 216381211. The next prime is 216381229. The reversal of 216381214 is 412183612.

It is a super-2 number, since 2×216381214² = 93641659544227592, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66807 + ... + 69970.

It is an arithmetic number, because the mean of its divisors is an integer number (23389038).

Almost surely, 2^216381214 is an apocalyptic number.

216381214 is a deficient number, since it is larger than the sum of its proper divisors (157843394).

216381214 is a wasteful number, since it uses less digits than its factorization.

216381214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136899.

The product of its digits is 2304, while the sum is 28.

The square root of 216381214 is about 14709.9019031399. The cubic root of 216381214 is about 600.3527684759.

The spelling of 216381214 in words is "two hundred sixteen million, three hundred eighty-one thousand, two hundred fourteen".