It is a happy number.
It is a congruent number.
It is an unprimeable number.
21101020 is an apocalyptic number.
1101020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is an amenable number.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1101020 is a wasteful number, since it uses less digits than its factorization.
1101020 is an evil number, because the sum of its binary digits is even.
The square root of 1101020 is about 1049.2950014176. The cubic root of 1101020 is about 103.2599085285.
Adding to 1101020 its reverse (201011), we get a palindrome (1302031).
Subtracting from 1101020 its reverse (201011), we obtain a palindrome (900009).
The spelling of 1101020 in words is "one million, one hundred one thousand, twenty".