1221120212 has 24 divisors (see below), whose sum is σ = 2344768776. Its totient is φ = 552958848.

The previous prime is 1221120211. The next prime is 1221120233. The reversal of 1221120212 is 2120211221.

It can be written as a sum of positive squares in 4 ways, for example, as 16613776 + 1204506436 = 4076^2 + 34706^2 .

It is a super-3 number, since 3×1221120212³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221120211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 218783 + ... + 224294.

It is an arithmetic number, because the mean of its divisors is an integer number (97698699).

Almost surely, 2^1221120212 is an apocalyptic number.

It is an amenable number.

1221120212 is a deficient number, since it is larger than the sum of its proper divisors (1123648564).

1221120212 is a wasteful number, since it uses less digits than its factorization.

1221120212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443147 (or 443145 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 1221120212 is about 34944.5305019255. The cubic root of 1221120212 is about 1068.8566737704.

Adding to 1221120212 its reverse (2120211221), we get a palindrome (3341331433).

It can be divided in two parts, 12211 and 20212, that added together give a palindrome (32423).

The spelling of 1221120212 in words is "one billion, two hundred twenty-one million, one hundred twenty thousand, two hundred twelve".