216115221061 has 16 divisors (see below), whose sum is σ = 227867457600. Its totient is φ = 204401086848.

The previous prime is 216115221059. The next prime is 216115221163. The reversal of 216115221061 is 160122511612.

It is a cyclic number.

It is not a de Polignac number, because 216115221061 - 2¹ = 216115221059 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 (216115221001) 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, 33622930 + ... + 33629356.

It is an arithmetic number, because the mean of its divisors is an integer number (14241716100).

Almost surely, 2^216115221061 is an apocalyptic number.

It is an amenable number.

216115221061 is a deficient number, since it is larger than the sum of its proper divisors (11752236539).

216115221061 is a wasteful number, since it uses less digits than its factorization.

216115221061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9108.

The product of its (nonzero) digits is 1440, while the sum is 28.

Adding to 216115221061 its reverse (160122511612), we get a palindrome (376237732673).

The spelling of 216115221061 in words is "two hundred sixteen billion, one hundred fifteen million, two hundred twenty-one thousand, sixty-one".