216357121 has 8 divisors (see below), whose sum is σ = 222203520. Its totient is φ = 210562608.

The previous prime is 216357109. The next prime is 216357151. The reversal of 216357121 is 121753612.

It is a happy number.

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 216357121 - 2⁷ = 216356993 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216357121.

It is not an unprimeable number, because it can be changed into a prime (216357101) 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, 4446 + ... + 21271.

It is an arithmetic number, because the mean of its divisors is an integer number (27775440).

Almost surely, 2^216357121 is an apocalyptic number.

It is an amenable number.

216357121 is a deficient number, since it is larger than the sum of its proper divisors (5846399).

216357121 is a wasteful number, since it uses less digits than its factorization.

216357121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25943.

The product of its digits is 2520, while the sum is 28.

The square root of 216357121 is about 14709.0829421824. The cubic root of 216357121 is about 600.3304855247.

The spelling of 216357121 in words is "two hundred sixteen million, three hundred fifty-seven thousand, one hundred twenty-one".