1243121010427 has 2 divisors, whose sum is σ = 1243121010428. Its totient is φ = 1243121010426.

The previous prime is 1243121010371. The next prime is 1243121010487. The reversal of 1243121010427 is 7240101213421.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1243121010427 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1243121010395 and 1243121010404.

It is not a weakly prime, because it can be changed into another prime (1243121010487) by changing a digit.

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 as a sum of consecutive naturals, namely, 621560505213 + 621560505214.

It is an arithmetic number, because the mean of its divisors is an integer number (621560505214).

Almost surely, 2^{1243121010427} is an apocalyptic number.

1243121010427 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243121010427 is an equidigital number, since it uses as much as digits as its factorization.

1243121010427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 28.

Adding to 1243121010427 its reverse (7240101213421), we get a palindrome (8483222223848).

The spelling of 1243121010427 in words is "one trillion, two hundred forty-three billion, one hundred twenty-one million, ten thousand, four hundred twenty-seven".