1212243421200 has 120 divisors (see below), whose sum is σ = 4437965469888. Its totient is φ = 277084208640.

The previous prime is 1212243421189. The next prime is 1212243421229. The reversal of 1212243421200 is 21243422121.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×1212243421200² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 72148947 + ... + 72165746.

Almost surely, 2^{1212243421200} is an apocalyptic number.

1212243421200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212243421200 is an abundant number, since it is smaller than the sum of its proper divisors (3225722048688).

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

1212243421200 is a wasteful number, since it uses less digits than its factorization.

1212243421200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144314721 (or 144314710 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 1212243421200 its reverse (21243422121), we get a palindrome (1233486843321).

The spelling of 1212243421200 in words is "one trillion, two hundred twelve billion, two hundred forty-three million, four hundred twenty-one thousand, two hundred".