216776121 has 8 divisors (see below), whose sum is σ = 289127904. Its totient is φ = 144470880.

The previous prime is 216776113. The next prime is 216776123. The reversal of 216776121 is 121677612.

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

It is not a de Polignac number, because 216776121 - 2³ = 216776113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216776123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1285 + ... + 20861.

It is an arithmetic number, because the mean of its divisors is an integer number (36140988).

Almost surely, 2^216776121 is an apocalyptic number.

It is an amenable number.

216776121 is a deficient number, since it is larger than the sum of its proper divisors (72351783).

216776121 is a wasteful number, since it uses less digits than its factorization.

216776121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23271.

The product of its digits is 7056, while the sum is 33.

The square root of 216776121 is about 14723.3189532795. The cubic root of 216776121 is about 600.7177715532.

The spelling of 216776121 in words is "two hundred sixteen million, seven hundred seventy-six thousand, one hundred twenty-one".