216210916 has 6 divisors (see below), whose sum is σ = 378369110. Its totient is φ = 108105456.

The previous prime is 216210859. The next prime is 216210919. The reversal of 216210916 is 619012612.

It can be written as a sum of positive squares in only one way, i.e., 179560000 + 36650916 = 13400^2 + 6054^2 .

It is not an unprimeable number, because it can be changed into a prime (216210919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27026361 + ... + 27026368.

Almost surely, 2^216210916 is an apocalyptic number.

It is an amenable number.

216210916 is a deficient number, since it is larger than the sum of its proper divisors (162158194).

216210916 is a wasteful number, since it uses less digits than its factorization.

216210916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54052733 (or 54052731 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 216210916 is about 14704.1122139353. The cubic root of 216210916 is about 600.1952290617.

The spelling of 216210916 in words is "two hundred sixteen million, two hundred ten thousand, nine hundred sixteen".