1213555204112 has 20 divisors (see below), whose sum is σ = 2453492043840. Its totient is φ = 580395967008.

The previous prime is 1213555204087. The next prime is 1213555204123. The reversal of 1213555204112 is 2114025553121.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1648851812 + ... + 1648852547.

It is an arithmetic number, because the mean of its divisors is an integer number (122674602192).

Almost surely, 2^{1213555204112} is an apocalyptic number.

It is an amenable number.

1213555204112 is an abundant number, since it is smaller than the sum of its proper divisors (1239936839728).

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

1213555204112 is a wasteful number, since it uses less digits than its factorization.

1213555204112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3297704390 (or 3297704384 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 32.

The spelling of 1213555204112 in words is "one trillion, two hundred thirteen billion, five hundred fifty-five million, two hundred four thousand, one hundred twelve".