216305612281 has 8 divisors (see below), whose sum is σ = 241725119328. Its totient is φ = 191845332000.

The previous prime is 216305612207. The next prime is 216305612287. The reversal of 216305612281 is 182216503612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 216305612281 - 2¹¹ = 216305610233 is a prime.

It is a super-2 number, since 2×216305612281² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 216305612281.

It is not an unprimeable number, because it can be changed into a prime (216305612287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 239806215 + ... + 239807116.

It is an arithmetic number, because the mean of its divisors is an integer number (30215639916).

Almost surely, 2^216305612281 is an apocalyptic number.

It is an amenable number.

216305612281 is a deficient number, since it is larger than the sum of its proper divisors (25419507047).

216305612281 is a wasteful number, since it uses less digits than its factorization.

216305612281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479613383.

The product of its (nonzero) digits is 34560, while the sum is 37.

The spelling of 216305612281 in words is "two hundred sixteen billion, three hundred five million, six hundred twelve thousand, two hundred eighty-one".