1243254533420 has 24 divisors (see below), whose sum is σ = 2700863298000. Its totient is φ = 480153474752.

The previous prime is 1243254533407. The next prime is 1243254533447. The reversal of 1243254533420 is 243354523421.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1071770570 + ... + 1071771729.

It is an arithmetic number, because the mean of its divisors is an integer number (112535970750).

Almost surely, 2^{1243254533420} is an apocalyptic number.

1243254533420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243254533420 is an abundant number, since it is smaller than the sum of its proper divisors (1457608764580).

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

1243254533420 is a wasteful number, since it uses less digits than its factorization.

1243254533420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2143542337 (or 2143542335 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 38.

Subtracting from 1243254533420 its reverse (243354523421), we obtain a palindrome (999900009999).

The spelling of 1243254533420 in words is "one trillion, two hundred forty-three billion, two hundred fifty-four million, five hundred thirty-three thousand, four hundred twenty".