216349299 has 20 divisors (see below), whose sum is σ = 326830680. Its totient is φ = 142607520.

The previous prime is 216349291. The next prime is 216349307. The reversal of 216349299 is 992943612.

It is a happy number.

216349299 is a `hidden beast` number, since 2 + 1 + 634 + 9 + 2 + 9 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (216349291) and next prime (216349307).

It is not a de Polignac number, because 216349299 - 2³ = 216349291 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216349291) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7797 + ... + 22214.

It is an arithmetic number, because the mean of its divisors is an integer number (16341534).

Almost surely, 2^216349299 is an apocalyptic number.

216349299 is a deficient number, since it is larger than the sum of its proper divisors (110481381).

216349299 is an equidigital number, since it uses as much as digits as its factorization.

216349299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30112 (or 30103 counting only the distinct ones).

The product of its digits is 209952, while the sum is 45.

The square root of 216349299 is about 14708.8170496475. The cubic root of 216349299 is about 600.3232508169.

The spelling of 216349299 in words is "two hundred sixteen million, three hundred forty-nine thousand, two hundred ninety-nine".