10020543454321 has 2 divisors, whose sum is σ = 10020543454322. Its totient is φ = 10020543454320.

The previous prime is 10020543454297. The next prime is 10020543454357. The reversal of 10020543454321 is 12345434502001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9801683223696 + 218860230625 = 3130764^2 + 467825^2 .

It is a cyclic number.

It is not a de Polignac number, because 10020543454321 - 2⁵ = 10020543454289 is a prime.

It is a super-2 number, since 2×10020543454321² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (10020543454391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5010271727160 + 5010271727161.

It is an arithmetic number, because the mean of its divisors is an integer number (5010271727161).

Almost surely, 2^{10020543454321} is an apocalyptic number.

It is an amenable number.

10020543454321 is a deficient number, since it is larger than the sum of its proper divisors (1).

10020543454321 is an equidigital number, since it uses as much as digits as its factorization.

10020543454321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 57600, while the sum is 34.

Adding to 10020543454321 its reverse (12345434502001), we get a palindrome (22365977956322).

The spelling of 10020543454321 in words is "ten trillion, twenty billion, five hundred forty-three million, four hundred fifty-four thousand, three hundred twenty-one".