216423266 has 16 divisors (see below), whose sum is σ = 332022240. Its totient is φ = 105774240.

The previous prime is 216423227. The next prime is 216423271. The reversal of 216423266 is 662324612.

It is a super-2 number, since 2×216423266² = 93678060132213512, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11390 + ... + 23718.

It is an arithmetic number, because the mean of its divisors is an integer number (20751390).

Almost surely, 2^216423266 is an apocalyptic number.

216423266 is a deficient number, since it is larger than the sum of its proper divisors (115598974).

216423266 is a wasteful number, since it uses less digits than its factorization.

216423266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12529.

The product of its digits is 20736, while the sum is 32.

The square root of 216423266 is about 14711.3312110087. The cubic root of 216423266 is about 600.3916572483.

Adding to 216423266 its reverse (662324612), we get a palindrome (878747878).

The spelling of 216423266 in words is "two hundred sixteen million, four hundred twenty-three thousand, two hundred sixty-six".