1243343400220 has 96 divisors (see below), whose sum is σ = 2721572130816. Its totient is φ = 476601216000.

The previous prime is 1243343400181. The next prime is 1243343400239. The reversal of 1243343400220 is 220043433421.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 83153745 + ... + 83168695.

It is an arithmetic number, because the mean of its divisors is an integer number (28349709696).

Almost surely, 2^{1243343400220} is an apocalyptic number.

1243343400220 is a gapful number since it is divisible by the number (10) 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 1243343400220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1360786065408).

1243343400220 is an abundant number, since it is smaller than the sum of its proper divisors (1478228730596).

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

1243343400220 is a wasteful number, since it uses less digits than its factorization.

1243343400220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16291 (or 16289 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 28.

Adding to 1243343400220 its reverse (220043433421), we get a palindrome (1463386833641).

The spelling of 1243343400220 in words is "one trillion, two hundred forty-three billion, three hundred forty-three million, four hundred thousand, two hundred twenty".