216070221 has 16 divisors (see below), whose sum is σ = 307378368. Its totient is φ = 134534400.

The previous prime is 216070199. The next prime is 216070247. The reversal of 216070221 is 122070612.

216070221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 216070221 - 2⁶ = 216070157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216071221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9490 + ... + 22851.

It is an arithmetic number, because the mean of its divisors is an integer number (19211148).

Almost surely, 2^216070221 is an apocalyptic number.

It is an amenable number.

216070221 is a deficient number, since it is larger than the sum of its proper divisors (91308147).

216070221 is a wasteful number, since it uses less digits than its factorization.

216070221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32492.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 216070221 is about 14699.3272295027. The cubic root of 216070221 is about 600.0650123998.

The spelling of 216070221 in words is "two hundred sixteen million, seventy thousand, two hundred twenty-one".