21241313453 has 2 divisors, whose sum is σ = 21241313454. Its totient is φ = 21241313452.

The previous prime is 21241313449. The next prime is 21241313551. The reversal of 21241313453 is 35431314212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21203145769 + 38167684 = 145613^2 + 6178^2 .

It is a cyclic number.

It is not a de Polignac number, because 21241313453 - 2² = 21241313449 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21241313053) 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, 10620656726 + 10620656727.

It is an arithmetic number, because the mean of its divisors is an integer number (10620656727).

Almost surely, 2^21241313453 is an apocalyptic number.

It is an amenable number.

21241313453 is a deficient number, since it is larger than the sum of its proper divisors (1).

21241313453 is an equidigital number, since it uses as much as digits as its factorization.

21241313453 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 29.

Adding to 21241313453 its reverse (35431314212), we get a palindrome (56672627665).

The spelling of 21241313453 in words is "twenty-one billion, two hundred forty-one million, three hundred thirteen thousand, four hundred fifty-three".