216173220 has 48 divisors (see below), whose sum is σ = 616714560. Its totient is φ = 56557696.

The previous prime is 216173219. The next prime is 216173233. The reversal of 216173220 is 22371612.

It is a super-2 number, since 2×216173220² = 93461722090336800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30810 + ... + 37169.

It is an arithmetic number, because the mean of its divisors is an integer number (12848220).

Almost surely, 2^216173220 is an apocalyptic number.

216173220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216173220 is an abundant number, since it is smaller than the sum of its proper divisors (400541340).

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

216173220 is a wasteful number, since it uses less digits than its factorization.

216173220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68044 (or 68042 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 216173220 is about 14702.8303397679. The cubic root of 216173220 is about 600.1603460337.

The spelling of 216173220 in words is "two hundred sixteen million, one hundred seventy-three thousand, two hundred twenty".