1212243342420 has 144 divisors (see below), whose sum is σ = 3927268134720. Its totient is φ = 278409922560.

The previous prime is 1212243342413. The next prime is 1212243342437. The reversal of 1212243342420 is 242433422121.

It is a super-2 number, since 2×1212243342420² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4256157 + ... + 4532036.

It is an arithmetic number, because the mean of its divisors is an integer number (27272695380).

Almost surely, 2^{1212243342420} is an apocalyptic number.

1212243342420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212243342420 is an abundant number, since it is smaller than the sum of its proper divisors (2715024792300).

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

1212243342420 is a wasteful number, since it uses less digits than its factorization.

1212243342420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8788246 (or 8788233 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 30.

Adding to 1212243342420 its reverse (242433422121), we get a palindrome (1454676764541).

The spelling of 1212243342420 in words is "one trillion, two hundred twelve billion, two hundred forty-three million, three hundred forty-two thousand, four hundred twenty".