216155071 has 4 divisors (see below), whose sum is σ = 235805544. Its totient is φ = 196504600.

The previous prime is 216155057. The next prime is 216155083. The reversal of 216155071 is 170551612.

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

It is a cyclic number.

It is not a de Polignac number, because 216155071 - 2¹⁵ = 216122303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216155171) 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, 9825220 + ... + 9825241.

It is an arithmetic number, because the mean of its divisors is an integer number (58951386).

Almost surely, 2^216155071 is an apocalyptic number.

216155071 is a deficient number, since it is larger than the sum of its proper divisors (19650473).

216155071 is a wasteful number, since it uses less digits than its factorization.

216155071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19650472.

The product of its (nonzero) digits is 2100, while the sum is 28.

The square root of 216155071 is about 14702.2131327226. The cubic root of 216155071 is about 600.1435499122.

The spelling of 216155071 in words is "two hundred sixteen million, one hundred fifty-five thousand, seventy-one".