21000330041 has 2 divisors, whose sum is σ = 21000330042. Its totient is φ = 21000330040.

The previous prime is 21000330017. The next prime is 21000330073. The reversal of 21000330041 is 14003300012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15844515625 + 5155814416 = 125875^2 + 71804^2 .

It is a cyclic number.

It is not a de Polignac number, because 21000330041 - 2²² = 20996135737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21000329998 and 21000330025.

It is not a weakly prime, because it can be changed into another prime (21000330641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500165020 + 10500165021.

It is an arithmetic number, because the mean of its divisors is an integer number (10500165021).

Almost surely, 2^21000330041 is an apocalyptic number.

It is an amenable number.

21000330041 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000330041 is an equidigital number, since it uses as much as digits as its factorization.

21000330041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21000330041 its reverse (14003300012), we get a palindrome (35003630053).

The spelling of 21000330041 in words is "twenty-one billion, three hundred thirty thousand, forty-one".