1243340433421 has 16 divisors (see below), whose sum is σ = 1315391673600. Its totient is φ = 1173535272000.

The previous prime is 1243340433341. The next prime is 1243340433437.

1243340433421 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 1243340433421 - 2²¹ = 1243338336269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243340433481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2455275 + ... + 2918056.

It is an arithmetic number, because the mean of its divisors is an integer number (82211979600).

Almost surely, 2^{1243340433421} is an apocalyptic number.

It is an amenable number.

1243340433421 is a deficient number, since it is larger than the sum of its proper divisors (72051240179).

1243340433421 is a wasteful number, since it uses less digits than its factorization.

1243340433421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5373540.

The product of its (nonzero) digits is 82944, while the sum is 34.

It can be divided in two parts, 1243340 and 433421, that added together give a palindrome (1676761).

The spelling of 1243340433421 in words is "one trillion, two hundred forty-three billion, three hundred forty million, four hundred thirty-three thousand, four hundred twenty-one".