1247433336421 has 2 divisors, whose sum is σ = 1247433336422. Its totient is φ = 1247433336420.

The previous prime is 1247433336419. The next prime is 1247433336427. The reversal of 1247433336421 is 1246333347421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 796636577025 + 450796759396 = 892545^2 + 671414^2 .

It is a cyclic number.

It is not a de Polignac number, because 1247433336421 - 2¹ = 1247433336419 is a prime.

Together with 1247433336419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1247433336427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 623716668210 + 623716668211.

It is an arithmetic number, because the mean of its divisors is an integer number (623716668211).

Almost surely, 2^{1247433336421} is an apocalyptic number.

It is an amenable number.

1247433336421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1247433336421 is an equidigital number, since it uses as much as digits as its factorization.

1247433336421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 43.

The spelling of 1247433336421 in words is "one trillion, two hundred forty-seven billion, four hundred thirty-three million, three hundred thirty-six thousand, four hundred twenty-one".