It is an unprimeable number.
Almost surely, 21211131340 is an apocalyptic number.
1211131340 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 1211131340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1348988256).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1211131340 is a wasteful number, since it uses less digits than its factorization.
1211131340 is an evil number, because the sum of its binary digits is even.
The square root of 1211131340 is about 34801.3123315774. The cubic root of 1211131340 is about 1065.9342430753.
Adding to 1211131340 its reverse (431311121), we get a palindrome (1642442461).
The spelling of 1211131340 in words is "one billion, two hundred eleven million, one hundred thirty-one thousand, three hundred forty".