It is a Curzon number.
It is a congruent number.
Almost surely, 221230154 is an apocalyptic number.
It is a practical number, because each smaller number is the sum of distinct divisors of 21230154, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26058240).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21230154 is a wasteful number, since it uses less digits than its factorization.
21230154 is an evil number, because the sum of its binary digits is even.
The square root of 21230154 is about 4607.6191248843. The cubic root of 21230154 is about 276.8966584840.
Adding to 21230154 its reverse (45103212), we get a palindrome (66333366).
The spelling of 21230154 in words is "twenty-one million, two hundred thirty thousand, one hundred fifty-four".