216171012 has 12 divisors (see below), whose sum is σ = 504399056. Its totient is φ = 72057000.

The previous prime is 216170987. The next prime is 216171013. The reversal of 216171012 is 210171612.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 216171012.

It is not an unprimeable number, because it can be changed into a prime (216171013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9007114 + ... + 9007137.

Almost surely, 2^216171012 is an apocalyptic number.

It is an amenable number.

216171012 is an abundant number, since it is smaller than the sum of its proper divisors (288228044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216171012 is a wasteful number, since it uses less digits than its factorization.

216171012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18014258 (or 18014256 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 21.

The square root of 216171012 is about 14702.7552519927. The cubic root of 216171012 is about 600.1583026745.

The spelling of 216171012 in words is "two hundred sixteen million, one hundred seventy-one thousand, twelve".