216122550 has 96 divisors (see below), whose sum is σ = 629221632. Its totient is φ = 48055680.

The previous prime is 216122539. The next prime is 216122551. The reversal of 216122550 is 55221612.

It is a happy number.

216122550 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 216122550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216122551) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 36069 + ... + 41631.

It is an arithmetic number, because the mean of its divisors is an integer number (6554392).

Almost surely, 2^216122550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216122550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (314610816).

216122550 is an abundant number, since it is smaller than the sum of its proper divisors (413099082).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216122550 is a wasteful number, since it uses less digits than its factorization.

216122550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5622 (or 5617 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 216122550 is about 14701.1071011676. The cubic root of 216122550 is about 600.1134507691.

The spelling of 216122550 in words is "two hundred sixteen million, one hundred twenty-two thousand, five hundred fifty".