21443541000521 has 2 divisors, whose sum is σ = 21443541000522. Its totient is φ = 21443541000520.

The previous prime is 21443541000373. The next prime is 21443541000533. The reversal of 21443541000521 is 12500014534412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11115422640400 + 10328118360121 = 3333980^2 + 3213739^2 .

It is a cyclic number.

It is not a de Polignac number, because 21443541000521 - 2²² = 21443536806217 is a prime.

It is not a weakly prime, because it can be changed into another prime (21443541000221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10721770500260 + 10721770500261.

It is an arithmetic number, because the mean of its divisors is an integer number (10721770500261).

Almost surely, 2^{21443541000521} is an apocalyptic number.

It is an amenable number.

21443541000521 is a deficient number, since it is larger than the sum of its proper divisors (1).

21443541000521 is an equidigital number, since it uses as much as digits as its factorization.

21443541000521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19200, while the sum is 32.

Adding to 21443541000521 its reverse (12500014534412), we get a palindrome (33943555534933).

The spelling of 21443541000521 in words is "twenty-one trillion, four hundred forty-three billion, five hundred forty-one million, five hundred twenty-one", and thus it is an aban number.