21500030442041 has 2 divisors, whose sum is σ = 21500030442042. Its totient is φ = 21500030442040.

The previous prime is 21500030442019. The next prime is 21500030442067. The reversal of 21500030442041 is 14024403000512.

It is an a-pointer prime, because the next prime (21500030442067) can be obtained adding 21500030442041 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18928590490000 + 2571439952041 = 4350700^2 + 1603571^2 .

It is a cyclic number.

It is not a de Polignac number, because 21500030442041 - 2⁶ = 21500030441977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21500030442041.

It is not a weakly prime, because it can be changed into another prime (21500030442091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10750015221020 + 10750015221021.

It is an arithmetic number, because the mean of its divisors is an integer number (10750015221021).

Almost surely, 2^{21500030442041} is an apocalyptic number.

It is an amenable number.

21500030442041 is a deficient number, since it is larger than the sum of its proper divisors (1).

21500030442041 is an equidigital number, since it uses as much as digits as its factorization.

21500030442041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 21500030442041 its reverse (14024403000512), we get a palindrome (35524433442553).

The spelling of 21500030442041 in words is "twenty-one trillion, five hundred billion, thirty million, four hundred forty-two thousand, forty-one".