1221002112 has 64 divisors (see below), whose sum is σ = 3538143360. Its totient is φ = 369999360.

The previous prime is 1221002087. The next prime is 1221002141. The reversal of 1221002112 is 2112001221.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140308 + ... + 148755.

It is an arithmetic number, because the mean of its divisors is an integer number (55283490).

Almost surely, 2^1221002112 is an apocalyptic number.

1221002112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221002112 is an abundant number, since it is smaller than the sum of its proper divisors (2317141248).

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

1221002112 is a wasteful number, since it uses less digits than its factorization.

1221002112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289091 (or 289079 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1221002112 is about 34942.8406401082. The cubic root of 1221002112 is about 1068.8222146888.

Adding to 1221002112 its reverse (2112001221), we get a palindrome (3333003333).

The spelling of 1221002112 in words is "one billion, two hundred twenty-one million, two thousand, one hundred twelve".