1212003312 has 160 divisors (see below), whose sum is σ = 3578104320. Its totient is φ = 350438400.

The previous prime is 1212003277. The next prime is 1212003329. The reversal of 1212003312 is 2133002121.

It is a junction number, because it is equal to n+sod(n) for n = 1212003291 and 1212003300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1789918 + ... + 1790594.

It is an arithmetic number, because the mean of its divisors is an integer number (22363152).

Almost surely, 2^1212003312 is an apocalyptic number.

1212003312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1212003312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1789052160).

1212003312 is an abundant number, since it is smaller than the sum of its proper divisors (2366101008).

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

1212003312 is a wasteful number, since it uses less digits than its factorization.

1212003312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 871 (or 865 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1212003312 is about 34813.8379383831. The cubic root of 1212003312 is about 1066.1899934391.

Adding to 1212003312 its reverse (2133002121), we get a palindrome (3345005433).

The spelling of 1212003312 in words is "one billion, two hundred twelve million, three thousand, three hundred twelve".