It is a happy number.
Almost surely, 21212210020 is an apocalyptic number.
1212210020 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 practical number, because each smaller number is the sum of distinct divisors of 1212210020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1502928000).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1212210020 is a wasteful number, since it uses less digits than its factorization.
1212210020 is an evil number, because the sum of its binary digits is even.
The square root of 1212210020 is about 34816.8065738373. The cubic root of 1212210020 is about 1066.2506031395.
Adding to 1212210020 its reverse (200122121), we get a palindrome (1412332141).
The spelling of 1212210020 in words is "one billion, two hundred twelve million, two hundred ten thousand, twenty".