216507235 has 12 divisors (see below), whose sum is σ = 302226768. Its totient is φ = 148461936.

The previous prime is 216507233. The next prime is 216507253. The reversal of 216507235 is 532705612.

It is not a de Polignac number, because 216507235 - 2¹ = 216507233 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216507197 and 216507206.

It is not an unprimeable number, because it can be changed into a prime (216507233) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 441607 + ... + 442096.

It is an arithmetic number, because the mean of its divisors is an integer number (25185564).

Almost surely, 2^216507235 is an apocalyptic number.

216507235 is a deficient number, since it is larger than the sum of its proper divisors (85719533).

216507235 is an equidigital number, since it uses as much as digits as its factorization.

216507235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883722 (or 883715 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 216507235 is about 14714.1848228164. The cubic root of 216507235 is about 600.4692948785.

The spelling of 216507235 in words is "two hundred sixteen million, five hundred seven thousand, two hundred thirty-five".