216206128 has 10 divisors (see below), whose sum is σ = 418899404. Its totient is φ = 108103056.

The previous prime is 216206099. The next prime is 216206131. The reversal of 216206128 is 821602612.

It is a junction number, because it is equal to n+sod(n) for n = 216206096 and 216206105.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6756426 + ... + 6756457.

Almost surely, 2^216206128 is an apocalyptic number.

It is an amenable number.

216206128 is a deficient number, since it is larger than the sum of its proper divisors (202693276).

216206128 is a wasteful number, since it uses less digits than its factorization.

216206128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13512891 (or 13512885 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 216206128 is about 14703.9494014363. The cubic root of 216206128 is about 600.1907985793.

The spelling of 216206128 in words is "two hundred sixteen million, two hundred six thousand, one hundred twenty-eight".