1243321400423 has 2 divisors, whose sum is σ = 1243321400424. Its totient is φ = 1243321400422.

The previous prime is 1243321400407. The next prime is 1243321400479. The reversal of 1243321400423 is 3240041233421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1243321400423 - 2⁴ = 1243321400407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243321405423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621660700211 + 621660700212.

It is an arithmetic number, because the mean of its divisors is an integer number (621660700212).

Almost surely, 2^{1243321400423} is an apocalyptic number.

1243321400423 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243321400423 is an equidigital number, since it uses as much as digits as its factorization.

1243321400423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 1243321400423 its reverse (3240041233421), we get a palindrome (4483362633844).

The spelling of 1243321400423 in words is "one trillion, two hundred forty-three billion, three hundred twenty-one million, four hundred thousand, four hundred twenty-three".