1221202112 has 84 divisors (see below), whose sum is σ = 2738719440. Its totient is φ = 539016192.

The previous prime is 1221202091. The next prime is 1221202133. The reversal of 1221202112 is 2112021221.

It is an interprime number because it is at equal distance from previous prime (1221202091) and next prime (1221202133).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 246314 + ... + 251222.

Almost surely, 2^1221202112 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 1221202112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1369359720).

1221202112 is an abundant number, since it is smaller than the sum of its proper divisors (1517517328).

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

1221202112 is a wasteful number, since it uses less digits than its factorization.

1221202112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4970 (or 4947 counting only the distinct ones).

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

The square root of 1221202112 is about 34945.7023394866. The cubic root of 1221202112 is about 1068.8805691531.

Adding to 1221202112 its reverse (2112021221), we get a palindrome (3333223333).

The spelling of 1221202112 in words is "one billion, two hundred twenty-one million, two hundred two thousand, one hundred twelve".