1221011212 has 48 divisors (see below), whose sum is σ = 2353155840. Its totient is φ = 551783232.

The previous prime is 1221011177. The next prime is 1221011221. The reversal of 1221011212 is 2121101221.

It is a junction number, because it is equal to n+sod(n) for n = 1221011192 and 1221011201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 955518 + ... + 956794.

It is an arithmetic number, because the mean of its divisors is an integer number (49024080).

Almost surely, 2^1221011212 is an apocalyptic number.

It is an amenable number.

1221011212 is a deficient number, since it is larger than the sum of its proper divisors (1132144628).

1221011212 is a wasteful number, since it uses less digits than its factorization.

1221011212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1870 (or 1868 counting only the distinct ones).

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

The square root of 1221011212 is about 34942.9708525191. The cubic root of 1221011212 is about 1068.8248699553.

Adding to 1221011212 its reverse (2121101221), we get a palindrome (3342112433).

Subtracting 1221011212 from its reverse (2121101221), we obtain a palindrome (900090009).

The spelling of 1221011212 in words is "one billion, two hundred twenty-one million, eleven thousand, two hundred twelve".