216120707221 has 8 divisors (see below), whose sum is σ = 217911276000. Its totient is φ = 214332271920.

The previous prime is 216120707189. The next prime is 216120707267. The reversal of 216120707221 is 122707021612.

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 216120707221 - 2⁵ = 216120707189 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 (216120707021) 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, 329611 + ... + 735448.

It is an arithmetic number, because the mean of its divisors is an integer number (27238909500).

Almost surely, 2^216120707221 is an apocalyptic number.

It is an amenable number.

216120707221 is a deficient number, since it is larger than the sum of its proper divisors (1790568779).

216120707221 is a wasteful number, since it uses less digits than its factorization.

216120707221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1066739.

The product of its (nonzero) digits is 4704, while the sum is 31.

Adding to 216120707221 its reverse (122707021612), we get a palindrome (338827728833).

The spelling of 216120707221 in words is "two hundred sixteen billion, one hundred twenty million, seven hundred seven thousand, two hundred twenty-one".