1243242205000 has 40 divisors (see below), whose sum is σ = 2912916498030. Its totient is φ = 497296880000.

The previous prime is 1243242204977. The next prime is 1243242205013. The reversal of 1243242205000 is 5022423421.

It can be written as a sum of positive squares in 5 ways, for example, as 16052383204 + 1227189821796 = 126698^2 + 1107786^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 124319221 + ... + 124329220.

Almost surely, 2^{1243242205000} is an apocalyptic number.

1243242205000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243242205000 is an abundant number, since it is smaller than the sum of its proper divisors (1669674293030).

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

1243242205000 is an equidigital number, since it uses as much as digits as its factorization.

1243242205000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248648467 (or 248648448 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

Adding to 1243242205000 its reverse (5022423421), we get a palindrome (1248264628421).

The spelling of 1243242205000 in words is "one trillion, two hundred forty-three billion, two hundred forty-two million, two hundred five thousand".