221121450 has 216 divisors, whose sum is σ = 679206528. Its totient is φ = 51480000.

The previous prime is 221121443. The next prime is 221121493. The reversal of 221121450 is 54121122.

221121450 is a `hidden beast` number, since 2 + 211 + 2 + 1 + 450 = 666.

221121450 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 1687885 + ... + 1688015.

Almost surely, 2^221121450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221121450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (339603264).

221121450 is an abundant number, since it is smaller than the sum of its proper divisors (458085078).

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

221121450 is a wasteful number, since it uses less digits than its factorization.

221121450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202 (or 183 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 221121450 is about 14870.1529918155. The cubic root of 221121450 is about 604.7050904283.

Adding to 221121450 its reverse (54121122), we get a palindrome (275242572).

The spelling of 221121450 in words is "two hundred twenty-one million, one hundred twenty-one thousand, four hundred fifty".