21021212041 has 2 divisors, whose sum is σ = 21021212042. Its totient is φ = 21021212040.

The previous prime is 21021211987. The next prime is 21021212053. The reversal of 21021212041 is 14021212012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17645137225 + 3376074816 = 132835^2 + 58104^2 .

It is a cyclic number.

It is not a de Polignac number, because 21021212041 - 2⁹ = 21021211529 is a prime.

It is not a weakly prime, because it can be changed into another prime (21021212141) 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, 10510606020 + 10510606021.

It is an arithmetic number, because the mean of its divisors is an integer number (10510606021).

Almost surely, 2^21021212041 is an apocalyptic number.

It is an amenable number.

21021212041 is a deficient number, since it is larger than the sum of its proper divisors (1).

21021212041 is an equidigital number, since it uses as much as digits as its factorization.

21021212041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21021212041 its reverse (14021212012), we get a palindrome (35042424053).

The spelling of 21021212041 in words is "twenty-one billion, twenty-one million, two hundred twelve thousand, forty-one".