1101221212 has 48 divisors (see below), whose sum is σ = 2396390080. Its totient is φ = 431142912.

The previous prime is 1101221197. The next prime is 1101221311. The reversal of 1101221212 is 2121221011.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 1101221192 and 1101221201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19714 + ... + 50902.

Almost surely, 2^1101221212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1101221212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1198195040).

1101221212 is an abundant number, since it is smaller than the sum of its proper divisors (1295168868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1101221212 is a wasteful number, since it uses less digits than its factorization.

1101221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31310 (or 31308 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1101221212 is about 33184.6532602045. The cubic root of 1101221212 is about 1032.6619841342.

Adding to 1101221212 its reverse (2121221011), we get a palindrome (3222442223).

The spelling of 1101221212 in words is "one billion, one hundred one million, two hundred twenty-one thousand, two hundred twelve".