216804122 has 4 divisors (see below), whose sum is σ = 325206186. Its totient is φ = 108402060.

The previous prime is 216804097. The next prime is 216804143. The reversal of 216804122 is 221408612.

It is a happy number.

216804122 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 202749121 + 14055001 = 14239^2 + 3749^2 .

It is a junction number, because it is equal to n+sod(n) for n = 216804091 and 216804100.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54201029 + ... + 54201032.

Almost surely, 2^216804122 is an apocalyptic number.

216804122 is a deficient number, since it is larger than the sum of its proper divisors (108402064).

216804122 is a wasteful number, since it uses less digits than its factorization.

216804122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108402063.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 216804122 is about 14724.2698290951. The cubic root of 216804122 is about 600.7436353707.

The spelling of 216804122 in words is "two hundred sixteen million, eight hundred four thousand, one hundred twenty-two".