216125221 has 8 divisors (see below), whose sum is σ = 234146304. Its totient is φ = 198303600.

The previous prime is 216125219. The next prime is 216125291. The reversal of 216125221 is 122521612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 216125221 - 2¹ = 216125219 is a prime.

It is a super-2 number, since 2×216125221² = 93420222304597682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216125192 and 216125201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216125291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47605 + ... + 51946.

It is an arithmetic number, because the mean of its divisors is an integer number (29268288).

Almost surely, 2^216125221 is an apocalyptic number.

It is an amenable number.

216125221 is a deficient number, since it is larger than the sum of its proper divisors (18021083).

216125221 is a wasteful number, since it uses less digits than its factorization.

216125221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99731.

The product of its digits is 480, while the sum is 22.

The square root of 216125221 is about 14701.1979443853. The cubic root of 216125221 is about 600.1159229720.

Adding to 216125221 its reverse (122521612), we get a palindrome (338646833).

The spelling of 216125221 in words is "two hundred sixteen million, one hundred twenty-five thousand, two hundred twenty-one".