It is an unprimeable number.
Almost surely, 221301000 is an apocalyptic number.
21301000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 21301000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30326400).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21301000 is a wasteful number, since it uses less digits than its factorization.
21301000 is an evil number, because the sum of its binary digits is even.
The square root of 21301000 is about 4615.3006402617. The cubic root of 21301000 is about 277.2043221349.
Adding to 21301000 its reverse (10312), we get a palindrome (21311312).
The spelling of 21301000 in words is "twenty-one million, three hundred one thousand".