1243321401043 has 4 divisors (see below), whose sum is σ = 1247564819088. Its totient is φ = 1239077983000.

The previous prime is 1243321401019. The next prime is 1243321401053. The reversal of 1243321401043 is 3401041233421.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1243321401043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243321401053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2121708583 + ... + 2121709168.

It is an arithmetic number, because the mean of its divisors is an integer number (311891204772).

Almost surely, 2^{1243321401043} is an apocalyptic number.

1243321401043 is a deficient number, since it is larger than the sum of its proper divisors (4243418045).

1243321401043 is an equidigital number, since it uses as much as digits as its factorization.

1243321401043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4243418044.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 1243321401043 its reverse (3401041233421), we get a palindrome (4644362634464).

The spelling of 1243321401043 in words is "one trillion, two hundred forty-three billion, three hundred twenty-one million, four hundred one thousand, forty-three".