1213120321200 has 90 divisors (see below), whose sum is σ = 4209864504924. Its totient is φ = 323498751360.

The previous prime is 1213120321187. The next prime is 1213120321219. The reversal of 1213120321200 is 21230213121.

1213120321200 is a `hidden beast` number, since 1 + 21 + 3 + 120 + 321 + 200 = 666.

It is a tau number, because it is divible by the number of its divisors (90).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 168485334 + ... + 168492533.

Almost surely, 2^{1213120321200} is an apocalyptic number.

1213120321200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213120321200 is an abundant number, since it is smaller than the sum of its proper divisors (2996744183724).

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

1213120321200 is a wasteful number, since it uses less digits than its factorization.

1213120321200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336977891 (or 336977877 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 1213120321200 its reverse (21230213121), we get a palindrome (1234350534321).

The spelling of 1213120321200 in words is "one trillion, two hundred thirteen billion, one hundred twenty million, three hundred twenty-one thousand, two hundred".